Sm4Fe31Si3 crystallizes in the triclinic P1 space group. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 19-coordinate geometry to one Fe(1), one Fe(12), one Fe(13), one Fe(15), one Fe(18), one Fe(19), one Fe(24), one Fe(28), one Fe(29), one Fe(3), one Fe(5), one Fe(7), one Fe(9), two equivalent Fe(26), two equivalent Fe(30), one Si(1), and one Si(3) atom. In the second Sm site, Sm(2) is bonded in a 19-coordinate geometry to one Fe(10), one Fe(11), one Fe(14), one Fe(16), one Fe(17), one Fe(2), one Fe(20), one Fe(23), one Fe(25), one Fe(28), one Fe(29), one Fe(4), one Fe(6), one Fe(8), two equivalent Fe(27), two equivalent Fe(31), and one Si(2) atom. In the third Sm site, Sm(3) is bonded in a 19-coordinate geometry to one Fe(11), one Fe(13), one Fe(16), one Fe(17), one Fe(2), one Fe(21), one Fe(23), one Fe(26), one Fe(28), one Fe(3), one Fe(30), one Fe(5), one Fe(7), one Fe(9), two equivalent Fe(24), one Si(3), and two equivalent Si(1) atoms. In the fourth Sm site, Sm(4) is bonded in a 19-coordinate geometry to one Fe(1), one Fe(10), one Fe(12), one Fe(14), one Fe(15), one Fe(18), one Fe(22), one Fe(23), one Fe(27), one Fe(29), one Fe(31), one Fe(4), one Fe(6), one Fe(8), two equivalent Fe(25), one Si(3), and two equivalent Si(2) atoms. There are thirty-one inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to one Sm(1), one Sm(4), one Fe(10), one Fe(15), one Fe(18), one Fe(19), one Fe(22), one Fe(25), one Fe(26), one Fe(29), one Fe(7), and one Si(3) atom. In the second Fe site, Fe(2) is bonded in a 12-coordinate geometry to one Sm(2), one Sm(3), one Fe(16), one Fe(17), one Fe(20), one Fe(21), one Fe(23), one Fe(24), one Fe(27), one Fe(28), one Fe(8), and one Fe(9) atom. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to one Sm(1), one Sm(3), one Fe(11), one Fe(13), one Fe(17), one Fe(20), one Fe(21), one Fe(24), one Fe(28), one Fe(30), one Fe(9), and one Si(1) atom. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one Sm(2), one Sm(4), one Fe(10), one Fe(12), one Fe(14), one Fe(18), one Fe(19), one Fe(22), one Fe(25), one Fe(29), one Fe(31), and one Si(2) atom. In the fifth Fe site, Fe(5) is bonded in a 12-coordinate geometry to one Sm(1), one Sm(3), one Fe(12), one Fe(13), one Fe(15), one Fe(19), one Fe(22), one Fe(26), one Fe(30), one Fe(7), one Si(1), and one Si(3) atom. In the sixth Fe site, Fe(6) is bonded in a 12-coordinate geometry to one Sm(2), one Sm(4), one Fe(11), one Fe(14), one Fe(16), one Fe(20), one Fe(21), one Fe(23), one Fe(27), one Fe(31), one Fe(8), and one Si(2) atom. In the seventh Fe site, Fe(7) is bonded in a 12-coordinate geometry to one Sm(1), one Sm(3), one Fe(1), one Fe(13), one Fe(18), one Fe(19), one Fe(22), one Fe(24), one Fe(26), one Fe(30), one Fe(5), and one Si(3) atom. In the eighth Fe site, Fe(8) is bonded in a 12-coordinate geometry to one Sm(2), one Sm(4), one Fe(14), one Fe(17), one Fe(2), one Fe(20), one Fe(21), one Fe(23), one Fe(25), one Fe(27), one Fe(31), and one Fe(6) atom. In the ninth Fe site, Fe(9) is bonded in a 12-coordinate geometry to one Sm(1), one Sm(3), one Fe(13), one Fe(16), one Fe(2), one Fe(20), one Fe(21), one Fe(24), one Fe(26), one Fe(28), one Fe(3), and one Si(1) atom. In the tenth Fe site, Fe(10) is bonded in a 12-coordinate geometry to one Sm(2), one Sm(4), one Fe(1), one Fe(14), one Fe(15), one Fe(19), one Fe(22), one Fe(25), one Fe(27), one Fe(29), one Fe(4), and one Si(2) atom. In the eleventh Fe site, Fe(11) is bonded in a 12-coordinate geometry to one Sm(2), one Sm(3), one Fe(16), one Fe(17), one Fe(20), one Fe(21), one Fe(23), one Fe(28), one Fe(3), one Fe(31), one Fe(6), and one Si(1) atom. In the twelfth Fe site, Fe(12) is bonded in a 12-coordinate geometry to one Sm(1), one Sm(4), one Fe(15), one Fe(18), one Fe(19), one Fe(22), one Fe(29), one Fe(30), one Fe(4), one Fe(5), one Si(2), and one Si(3) atom. In the thirteenth Fe site, Fe(13) is bonded to one Sm(1), one Sm(3), one Fe(19), one Fe(21), one Fe(24), one Fe(26), one Fe(3), one Fe(30), one Fe(5), one Fe(7), one Fe(9), and one Si(1) atom to form distorted FeSm2Fe9Si cuboctahedra that share  a cornercorner with one Fe(17)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(16)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(18)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a cornercorner with one Fe(26)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(24)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(1)Sm3Fe9 cuboctahedra, corners with three equivalent Fe(28)Sm3Fe8Si cuboctahedra, corners with three equivalent Si(3)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(30)Sm3Fe7Si2 cuboctahedra,  an edgeedge with one Fe(26)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(29)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(24)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(1)Sm3Fe9 cuboctahedra,  a faceface with one Fe(17)Sm2Fe10 cuboctahedra,  a faceface with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a faceface with one Fe(16)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(18)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Si(1)Sm3Fe9 cuboctahedra, and  a faceface with one Si(3)Sm3Fe9 cuboctahedra. In the fourteenth Fe site, Fe(14) is bonded to one Sm(2), one Sm(4), one Fe(10), one Fe(20), one Fe(22), one Fe(25), one Fe(27), one Fe(31), one Fe(4), one Fe(6), one Fe(8), and one Si(2) atom to form distorted FeSm2Fe9Si cuboctahedra that share  a cornercorner with one Fe(17)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(16)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(18)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(31)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(25)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(27)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(2)Sm3Fe9 cuboctahedra, corners with three equivalent Fe(29)Sm3Fe8Si cuboctahedra, corners with three equivalent Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(28)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(31)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(25)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(27)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(2)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(3)Sm3Fe9 cuboctahedra,  a faceface with one Fe(17)Sm2Fe10 cuboctahedra,  a faceface with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a faceface with one Fe(16)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(18)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Fe(27)Sm3Fe9 cuboctahedra, and  a faceface with one Si(2)Sm3Fe9 cuboctahedra. In the fifteenth Fe site, Fe(15) is bonded to one Sm(1), one Sm(4), one Fe(1), one Fe(10), one Fe(12), one Fe(19), one Fe(22), one Fe(26), one Fe(29), one Fe(5), one Si(2), and one Si(3) atom to form distorted FeSm2Fe8Si2 cuboctahedra that share  a cornercorner with one Fe(13)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(14)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a cornercorner with one Fe(26)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(28)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(23)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(25)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(2)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(18)Sm2Fe9Si cuboctahedra, corners with two equivalent Fe(31)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(24)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(30)Sm3Fe7Si2 cuboctahedra,  an edgeedge with one Fe(29)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(25)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(27)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(1)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(3)Sm3Fe9 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Si(2)Sm3Fe9 cuboctahedra,  a faceface with one Si(3)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(18)Sm2Fe9Si cuboctahedra. In the sixteenth Fe site, Fe(16) is bonded to one Sm(2), one Sm(3), one Fe(11), one Fe(2), one Fe(20), one Fe(21), one Fe(23), one Fe(27), one Fe(28), one Fe(6), one Fe(9), and one Si(1) atom to form distorted FeSm2Fe9Si cuboctahedra that share  a cornercorner with one Fe(13)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(14)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(29)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(31)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(24)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(27)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(1)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(3)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(17)Sm2Fe10 cuboctahedra, corners with two equivalent Fe(30)Sm3Fe7Si2 cuboctahedra, corners with two equivalent Fe(25)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(26)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(28)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(31)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(24)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(2)Sm3Fe9 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Fe(27)Sm3Fe9 cuboctahedra,  a faceface with one Si(1)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(17)Sm2Fe10 cuboctahedra. In the seventeenth Fe site, Fe(17) is bonded to one Sm(2), one Sm(3), one Fe(11), one Fe(2), one Fe(20), one Fe(21), one Fe(23), one Fe(24), one Fe(28), one Fe(3), one Fe(31), and one Fe(8) atom to form FeSm2Fe10 cuboctahedra that share  a cornercorner with one Fe(13)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(14)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(29)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(31)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(24)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(27)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(1)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(3)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(16)Sm2Fe9Si cuboctahedra, corners with two equivalent Fe(26)Sm3Fe8Si cuboctahedra, corners with two equivalent Si(2)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(30)Sm3Fe7Si2 cuboctahedra,  an edgeedge with one Fe(28)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(25)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(27)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(1)Sm3Fe9 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Fe(27)Sm3Fe9 cuboctahedra,  a faceface with one Si(1)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(16)Sm2Fe9Si cuboctahedra. In the eighteenth Fe site, Fe(18) is bonded to one Sm(1), one Sm(4), one Fe(1), one Fe(12), one Fe(19), one Fe(22), one Fe(25), one Fe(29), one Fe(30), one Fe(4), one Fe(7), and one Si(3) atom to form distorted FeSm2Fe9Si cuboctahedra that share  a cornercorner with one Fe(13)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(14)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a cornercorner with one Fe(26)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(28)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(23)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(25)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(2)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(15)Sm2Fe8Si2 cuboctahedra, corners with two equivalent Fe(27)Sm3Fe9 cuboctahedra, corners with two equivalent Si(1)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(26)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(29)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(31)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(24)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(2)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(3)Sm3Fe9 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Si(2)Sm3Fe9 cuboctahedra,  a faceface with one Si(3)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(15)Sm2Fe8Si2 cuboctahedra. In the nineteenth Fe site, Fe(19) is bonded in a 14-coordinate geometry to one Sm(1), one Fe(1), one Fe(10), one Fe(12), one Fe(13), one Fe(15), one Fe(18), one Fe(22), one Fe(26), one Fe(29), one Fe(30), one Fe(4), one Fe(5), and one Fe(7) atom. In the twentieth Fe site, Fe(20) is bonded in a 14-coordinate geometry to one Sm(2), one Fe(11), one Fe(14), one Fe(16), one Fe(17), one Fe(2), one Fe(21), one Fe(27), one Fe(28), one Fe(3), one Fe(31), one Fe(6), one Fe(8), and one Fe(9) atom. In the twenty-first Fe site, Fe(21) is bonded in a 14-coordinate geometry to one Sm(3), one Fe(11), one Fe(13), one Fe(16), one Fe(17), one Fe(2), one Fe(20), one Fe(23), one Fe(24), one Fe(3), one Fe(6), one Fe(8), one Fe(9), and one Si(1) atom. In the twenty-second Fe site, Fe(22) is bonded in a 14-coordinate geometry to one Sm(4), one Fe(1), one Fe(10), one Fe(12), one Fe(14), one Fe(15), one Fe(18), one Fe(19), one Fe(25), one Fe(4), one Fe(5), one Fe(7), one Si(2), and one Si(3) atom. In the twenty-third Fe site, Fe(23) is bonded to one Sm(2), one Sm(3), one Sm(4), one Fe(11), one Fe(16), one Fe(17), one Fe(2), one Fe(21), one Fe(27), one Fe(31), one Fe(6), and one Fe(8) atom to form FeSm3Fe9 cuboctahedra that share  a cornercorner with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(18)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a cornercorner with one Fe(26)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(28)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(31)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(27)Sm3Fe9 cuboctahedra, corners with two equivalent Si(3)Sm3Fe9 cuboctahedra, corners with three equivalent Fe(14)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(17)Sm2Fe10 cuboctahedra,  an edgeedge with one Fe(13)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(16)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(29)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(24)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(25)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(1)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(2)Sm3Fe9 cuboctahedra,  a faceface with one Fe(17)Sm2Fe10 cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(16)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Fe(27)Sm3Fe9 cuboctahedra,  a faceface with one Si(1)Sm3Fe9 cuboctahedra, and  a faceface with one Si(2)Sm3Fe9 cuboctahedra. In the twenty-fourth Fe site, Fe(24) is bonded to one Sm(1), two equivalent Sm(3), one Fe(13), one Fe(17), one Fe(2), one Fe(21), one Fe(26), one Fe(28), one Fe(3), one Fe(7), and one Fe(9) atom to form FeSm3Fe9 cuboctahedra that share  a cornercorner with one Fe(17)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(13)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(16)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a cornercorner with one Fe(29)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(31)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(27)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(15)Sm2Fe8Si2 cuboctahedra, corners with two equivalent Fe(26)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(28)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(24)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(13)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(16)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(18)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(30)Sm3Fe7Si2 cuboctahedra,  an edgeedge with one Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(3)Sm3Fe9 cuboctahedra, edges with two equivalent Si(1)Sm3Fe9 cuboctahedra,  a faceface with one Fe(17)Sm2Fe10 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(16)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Si(3)Sm3Fe9 cuboctahedra, and faces with two equivalent Si(1)Sm3Fe9 cuboctahedra. In the twenty-fifth Fe site, Fe(25) is bonded to one Sm(2), two equivalent Sm(4), one Fe(1), one Fe(10), one Fe(14), one Fe(18), one Fe(22), one Fe(27), one Fe(29), one Fe(4), and one Fe(8) atom to form FeSm3Fe9 cuboctahedra that share  a cornercorner with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(14)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(18)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a cornercorner with one Fe(26)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(28)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(31)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(16)Sm2Fe9Si cuboctahedra, corners with two equivalent Fe(29)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(25)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(27)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(17)Sm2Fe10 cuboctahedra,  an edgeedge with one Fe(15)Sm2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(14)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(31)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(3)Sm3Fe9 cuboctahedra, edges with two equivalent Si(2)Sm3Fe9 cuboctahedra,  a faceface with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(18)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Fe(27)Sm3Fe9 cuboctahedra,  a faceface with one Si(3)Sm3Fe9 cuboctahedra, and faces with two equivalent Si(2)Sm3Fe9 cuboctahedra. In the twenty-sixth Fe site, Fe(26) is bonded to one Sm(3), two equivalent Sm(1), one Fe(1), one Fe(13), one Fe(15), one Fe(19), one Fe(24), one Fe(5), one Fe(7), one Fe(9), and one Si(3) atom to form FeSm3Fe8Si cuboctahedra that share  a cornercorner with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(13)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(18)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(23)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(25)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(1)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(2)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(17)Sm2Fe10 cuboctahedra, corners with two equivalent Fe(26)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(24)Sm3Fe9 cuboctahedra, corners with two equivalent Si(3)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(13)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(16)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(18)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(28)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(29)Sm3Fe8Si cuboctahedra,  an edgeedge with one Si(1)Sm3Fe9 cuboctahedra, edges with two equivalent Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(18)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Si(1)Sm3Fe9 cuboctahedra,  a faceface with one Si(3)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(30)Sm3Fe7Si2 cuboctahedra. In the twenty-seventh Fe site, Fe(27) is bonded to one Sm(4), two equivalent Sm(2), one Fe(10), one Fe(14), one Fe(16), one Fe(2), one Fe(20), one Fe(23), one Fe(25), one Fe(6), and one Fe(8) atom to form FeSm3Fe9 cuboctahedra that share  a cornercorner with one Fe(17)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(14)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(16)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(24)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(1)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(2)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(3)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(18)Sm2Fe9Si cuboctahedra, corners with two equivalent Fe(23)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(25)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(27)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(17)Sm2Fe10 cuboctahedra,  an edgeedge with one Fe(15)Sm2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(14)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(28)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(29)Sm3Fe8Si cuboctahedra,  an edgeedge with one Si(2)Sm3Fe9 cuboctahedra, edges with two equivalent Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(17)Sm2Fe10 cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(16)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Si(2)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(31)Sm3Fe8Si cuboctahedra. In the twenty-eighth Fe site, Fe(28) is bonded to one Sm(1), one Sm(2), one Sm(3), one Fe(11), one Fe(16), one Fe(17), one Fe(2), one Fe(20), one Fe(24), one Fe(3), one Fe(9), and one Si(1) atom to form distorted FeSm3Fe8Si cuboctahedra that share  a cornercorner with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(18)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(25)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(2)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(29)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(23)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(24)Sm3Fe9 cuboctahedra, corners with two equivalent Si(1)Sm3Fe9 cuboctahedra, corners with three equivalent Fe(13)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(17)Sm2Fe10 cuboctahedra,  an edgeedge with one Fe(14)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(16)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(30)Sm3Fe7Si2 cuboctahedra,  an edgeedge with one Fe(26)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(31)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(27)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(3)Sm3Fe9 cuboctahedra,  a faceface with one Fe(17)Sm2Fe10 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(16)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Fe(27)Sm3Fe9 cuboctahedra, and  a faceface with one Si(1)Sm3Fe9 cuboctahedra. In the twenty-ninth Fe site, Fe(29) is bonded to one Sm(1), one Sm(2), one Sm(4), one Fe(1), one Fe(10), one Fe(12), one Fe(15), one Fe(18), one Fe(19), one Fe(25), one Fe(4), and one Si(2) atom to form FeSm3Fe8Si cuboctahedra that share  a cornercorner with one Fe(17)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(16)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(24)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(1)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(28)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(25)Sm3Fe9 cuboctahedra, corners with two equivalent Si(2)Sm3Fe9 cuboctahedra, corners with two equivalent Si(3)Sm3Fe9 cuboctahedra, corners with three equivalent Fe(14)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(15)Sm2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(13)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(18)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(30)Sm3Fe7Si2 cuboctahedra,  an edgeedge with one Fe(26)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(31)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(27)Sm3Fe9 cuboctahedra,  a faceface with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(18)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Fe(27)Sm3Fe9 cuboctahedra,  a faceface with one Si(2)Sm3Fe9 cuboctahedra, and  a faceface with one Si(3)Sm3Fe9 cuboctahedra. In the thirtieth Fe site, Fe(30) is bonded to one Sm(3), two equivalent Sm(1), one Fe(12), one Fe(13), one Fe(18), one Fe(19), one Fe(3), one Fe(5), one Fe(7), one Si(1), and one Si(3) atom to form distorted FeSm3Fe7Si2 cuboctahedra that share  a cornercorner with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(13)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(18)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(23)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(24)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(25)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(2)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(16)Sm2Fe9Si cuboctahedra, corners with two equivalent Fe(30)Sm3Fe7Si2 cuboctahedra, corners with two equivalent Si(1)Sm3Fe9 cuboctahedra, corners with two equivalent Si(3)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(17)Sm2Fe10 cuboctahedra,  an edgeedge with one Fe(15)Sm2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(13)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(28)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(29)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(24)Sm3Fe9 cuboctahedra, edges with two equivalent Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(18)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Si(1)Sm3Fe9 cuboctahedra,  a faceface with one Si(3)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(26)Sm3Fe8Si cuboctahedra. In the thirty-first Fe site, Fe(31) is bonded to one Sm(4), two equivalent Sm(2), one Fe(11), one Fe(14), one Fe(17), one Fe(20), one Fe(23), one Fe(4), one Fe(6), one Fe(8), and one Si(2) atom to form distorted FeSm3Fe8Si cuboctahedra that share  a cornercorner with one Fe(17)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(14)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(16)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(24)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(25)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(1)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(3)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(15)Sm2Fe8Si2 cuboctahedra, corners with two equivalent Fe(31)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(23)Sm3Fe9 cuboctahedra, corners with two equivalent Si(2)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(14)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(16)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(18)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(28)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(29)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(25)Sm3Fe9 cuboctahedra, edges with two equivalent Fe(27)Sm3Fe9 cuboctahedra,  a faceface with one Fe(17)Sm2Fe10 cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(16)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Si(2)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(27)Sm3Fe9 cuboctahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one Sm(1), two equivalent Sm(3), one Fe(11), one Fe(13), one Fe(16), one Fe(21), one Fe(28), one Fe(3), one Fe(30), one Fe(5), and one Fe(9) atom to form SiSm3Fe9 cuboctahedra that share  a cornercorner with one Fe(17)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(13)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(16)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(26)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(29)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(31)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(27)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(18)Sm2Fe9Si cuboctahedra, corners with two equivalent Fe(30)Sm3Fe7Si2 cuboctahedra, corners with two equivalent Fe(28)Sm3Fe8Si cuboctahedra, corners with two equivalent Si(1)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(17)Sm2Fe10 cuboctahedra,  an edgeedge with one Fe(15)Sm2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(13)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(26)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(3)Sm3Fe9 cuboctahedra, edges with two equivalent Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Fe(17)Sm2Fe10 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(16)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Si(3)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(24)Sm3Fe9 cuboctahedra. In the second Si site, Si(2) is bonded to one Sm(2), two equivalent Sm(4), one Fe(10), one Fe(12), one Fe(14), one Fe(15), one Fe(22), one Fe(29), one Fe(31), one Fe(4), and one Fe(6) atom to form distorted SiSm3Fe9 cuboctahedra that share  a cornercorner with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(14)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(18)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a cornercorner with one Fe(26)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(28)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(27)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(17)Sm2Fe10 cuboctahedra, corners with two equivalent Fe(29)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(31)Sm3Fe8Si cuboctahedra, corners with two equivalent Si(2)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(14)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(16)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(18)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(27)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(3)Sm3Fe9 cuboctahedra, edges with two equivalent Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(18)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Fe(27)Sm3Fe9 cuboctahedra,  a faceface with one Si(3)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(25)Sm3Fe9 cuboctahedra. In the third Si site, Si(3) is bonded to one Sm(1), one Sm(3), one Sm(4), one Fe(1), one Fe(12), one Fe(15), one Fe(18), one Fe(22), one Fe(26), one Fe(30), one Fe(5), and one Fe(7) atom to form distorted SiSm3Fe9 cuboctahedra that share  a cornercorner with one Fe(17)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(16)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(31)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(27)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(30)Sm3Fe7Si2 cuboctahedra, corners with two equivalent Fe(26)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(29)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(23)Sm3Fe9 cuboctahedra, corners with three equivalent Fe(13)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(15)Sm2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(14)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(18)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(28)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(24)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(25)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(1)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(2)Sm3Fe9 cuboctahedra,  a faceface with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(18)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Si(1)Sm3Fe9 cuboctahedra, and  a faceface with one Si(2)Sm3Fe9 cuboctahedra.
Sm4Fe31Si3 crystallizes in the triclinic P1 space group. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 19-coordinate geometry to one Fe(1), one Fe(12), one Fe(13), one Fe(15), one Fe(18), one Fe(19), one Fe(24), one Fe(28), one Fe(29), one Fe(3), one Fe(5), one Fe(7), one Fe(9), two equivalent Fe(26), two equivalent Fe(30), one Si(1), and one Si(3) atom. The Sm(1)-Fe(1) bond length is 2.99 Å. The Sm(1)-Fe(12) bond length is 3.00 Å. The Sm(1)-Fe(13) bond length is 3.26 Å. The Sm(1)-Fe(15) bond length is 3.26 Å. The Sm(1)-Fe(18) bond length is 3.26 Å. The Sm(1)-Fe(19) bond length is 3.01 Å. The Sm(1)-Fe(24) bond length is 3.08 Å. The Sm(1)-Fe(28) bond length is 3.22 Å. The Sm(1)-Fe(29) bond length is 3.17 Å. The Sm(1)-Fe(3) bond length is 3.00 Å. The Sm(1)-Fe(5) bond length is 3.01 Å. The Sm(1)-Fe(7) bond length is 3.01 Å. The Sm(1)-Fe(9) bond length is 2.99 Å. There is one shorter (3.17 Å) and one longer (3.21 Å) Sm(1)-Fe(26) bond length. There is one shorter (3.16 Å) and one longer (3.24 Å) Sm(1)-Fe(30) bond length. The Sm(1)-Si(1) bond length is 3.11 Å. The Sm(1)-Si(3) bond length is 3.11 Å. In the second Sm site, Sm(2) is bonded in a 19-coordinate geometry to one Fe(10), one Fe(11), one Fe(14), one Fe(16), one Fe(17), one Fe(2), one Fe(20), one Fe(23), one Fe(25), one Fe(28), one Fe(29), one Fe(4), one Fe(6), one Fe(8), two equivalent Fe(27), two equivalent Fe(31), and one Si(2) atom. The Sm(2)-Fe(10) bond length is 3.01 Å. The Sm(2)-Fe(11) bond length is 3.01 Å. The Sm(2)-Fe(14) bond length is 3.27 Å. The Sm(2)-Fe(16) bond length is 3.27 Å. The Sm(2)-Fe(17) bond length is 3.25 Å. The Sm(2)-Fe(2) bond length is 3.00 Å. The Sm(2)-Fe(20) bond length is 3.02 Å. The Sm(2)-Fe(23) bond length is 3.07 Å. The Sm(2)-Fe(25) bond length is 3.08 Å. The Sm(2)-Fe(28) bond length is 3.17 Å. The Sm(2)-Fe(29) bond length is 3.21 Å. The Sm(2)-Fe(4) bond length is 3.02 Å. The Sm(2)-Fe(6) bond length is 3.01 Å. The Sm(2)-Fe(8) bond length is 3.01 Å. There is one shorter (3.18 Å) and one longer (3.20 Å) Sm(2)-Fe(27) bond length. There is one shorter (3.17 Å) and one longer (3.23 Å) Sm(2)-Fe(31) bond length. The Sm(2)-Si(2) bond length is 3.12 Å. In the third Sm site, Sm(3) is bonded in a 19-coordinate geometry to one Fe(11), one Fe(13), one Fe(16), one Fe(17), one Fe(2), one Fe(21), one Fe(23), one Fe(26), one Fe(28), one Fe(3), one Fe(30), one Fe(5), one Fe(7), one Fe(9), two equivalent Fe(24), one Si(3), and two equivalent Si(1) atoms. The Sm(3)-Fe(11) bond length is 3.01 Å. The Sm(3)-Fe(13) bond length is 3.25 Å. The Sm(3)-Fe(16) bond length is 3.25 Å. The Sm(3)-Fe(17) bond length is 3.27 Å. The Sm(3)-Fe(2) bond length is 3.00 Å. The Sm(3)-Fe(21) bond length is 3.05 Å. The Sm(3)-Fe(23) bond length is 3.18 Å. The Sm(3)-Fe(26) bond length is 3.07 Å. The Sm(3)-Fe(28) bond length is 3.06 Å. The Sm(3)-Fe(3) bond length is 3.00 Å. The Sm(3)-Fe(30) bond length is 3.08 Å. The Sm(3)-Fe(5) bond length is 3.00 Å. The Sm(3)-Fe(7) bond length is 3.00 Å. The Sm(3)-Fe(9) bond length is 3.01 Å. There is one shorter (3.18 Å) and one longer (3.22 Å) Sm(3)-Fe(24) bond length. The Sm(3)-Si(3) bond length is 3.21 Å. There is one shorter (3.18 Å) and one longer (3.21 Å) Sm(3)-Si(1) bond length. In the fourth Sm site, Sm(4) is bonded in a 19-coordinate geometry to one Fe(1), one Fe(10), one Fe(12), one Fe(14), one Fe(15), one Fe(18), one Fe(22), one Fe(23), one Fe(27), one Fe(29), one Fe(31), one Fe(4), one Fe(6), one Fe(8), two equivalent Fe(25), one Si(3), and two equivalent Si(2) atoms. The Sm(4)-Fe(1) bond length is 3.00 Å. The Sm(4)-Fe(10) bond length is 3.01 Å. The Sm(4)-Fe(12) bond length is 3.00 Å. The Sm(4)-Fe(14) bond length is 3.26 Å. The Sm(4)-Fe(15) bond length is 3.25 Å. The Sm(4)-Fe(18) bond length is 3.26 Å. The Sm(4)-Fe(22) bond length is 3.07 Å. The Sm(4)-Fe(23) bond length is 3.20 Å. The Sm(4)-Fe(27) bond length is 3.07 Å. The Sm(4)-Fe(29) bond length is 3.07 Å. The Sm(4)-Fe(31) bond length is 3.05 Å. The Sm(4)-Fe(4) bond length is 3.01 Å. The Sm(4)-Fe(6) bond length is 3.00 Å. The Sm(4)-Fe(8) bond length is 3.00 Å. Both Sm(4)-Fe(25) bond lengths are 3.20 Å. The Sm(4)-Si(3) bond length is 3.18 Å. There is one shorter (3.18 Å) and one longer (3.21 Å) Sm(4)-Si(2) bond length. There are thirty-one inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to one Sm(1), one Sm(4), one Fe(10), one Fe(15), one Fe(18), one Fe(19), one Fe(22), one Fe(25), one Fe(26), one Fe(29), one Fe(7), and one Si(3) atom. The Fe(1)-Fe(10) bond length is 2.48 Å. The Fe(1)-Fe(15) bond length is 2.43 Å. The Fe(1)-Fe(18) bond length is 2.42 Å. The Fe(1)-Fe(19) bond length is 2.75 Å. The Fe(1)-Fe(22) bond length is 2.76 Å. The Fe(1)-Fe(25) bond length is 2.51 Å. The Fe(1)-Fe(26) bond length is 2.50 Å. The Fe(1)-Fe(29) bond length is 2.63 Å. The Fe(1)-Fe(7) bond length is 2.48 Å. The Fe(1)-Si(3) bond length is 2.63 Å. In the second Fe site, Fe(2) is bonded in a 12-coordinate geometry to one Sm(2), one Sm(3), one Fe(16), one Fe(17), one Fe(20), one Fe(21), one Fe(23), one Fe(24), one Fe(27), one Fe(28), one Fe(8), and one Fe(9) atom. The Fe(2)-Fe(16) bond length is 2.43 Å. The Fe(2)-Fe(17) bond length is 2.42 Å. The Fe(2)-Fe(20) bond length is 2.75 Å. The Fe(2)-Fe(21) bond length is 2.75 Å. The Fe(2)-Fe(23) bond length is 2.62 Å. The Fe(2)-Fe(24) bond length is 2.52 Å. The Fe(2)-Fe(27) bond length is 2.52 Å. The Fe(2)-Fe(28) bond length is 2.61 Å. The Fe(2)-Fe(8) bond length is 2.49 Å. The Fe(2)-Fe(9) bond length is 2.48 Å. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to one Sm(1), one Sm(3), one Fe(11), one Fe(13), one Fe(17), one Fe(20), one Fe(21), one Fe(24), one Fe(28), one Fe(30), one Fe(9), and one Si(1) atom. The Fe(3)-Fe(11) bond length is 2.47 Å. The Fe(3)-Fe(13) bond length is 2.41 Å. The Fe(3)-Fe(17) bond length is 2.43 Å. The Fe(3)-Fe(20) bond length is 2.75 Å. The Fe(3)-Fe(21) bond length is 2.73 Å. The Fe(3)-Fe(24) bond length is 2.63 Å. The Fe(3)-Fe(28) bond length is 2.53 Å. The Fe(3)-Fe(30) bond length is 2.62 Å. The Fe(3)-Fe(9) bond length is 2.48 Å. The Fe(3)-Si(1) bond length is 2.50 Å. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one Sm(2), one Sm(4), one Fe(10), one Fe(12), one Fe(14), one Fe(18), one Fe(19), one Fe(22), one Fe(25), one Fe(29), one Fe(31), and one Si(2) atom. The Fe(4)-Fe(10) bond length is 2.48 Å. The Fe(4)-Fe(12) bond length is 2.48 Å. The Fe(4)-Fe(14) bond length is 2.42 Å. The Fe(4)-Fe(18) bond length is 2.42 Å. The Fe(4)-Fe(19) bond length is 2.74 Å. The Fe(4)-Fe(22) bond length is 2.74 Å. The Fe(4)-Fe(25) bond length is 2.62 Å. The Fe(4)-Fe(29) bond length is 2.51 Å. The Fe(4)-Fe(31) bond length is 2.62 Å. The Fe(4)-Si(2) bond length is 2.51 Å. In the fifth Fe site, Fe(5) is bonded in a 12-coordinate geometry to one Sm(1), one Sm(3), one Fe(12), one Fe(13), one Fe(15), one Fe(19), one Fe(22), one Fe(26), one Fe(30), one Fe(7), one Si(1), and one Si(3) atom. The Fe(5)-Fe(12) bond length is 2.48 Å. The Fe(5)-Fe(13) bond length is 2.41 Å. The Fe(5)-Fe(15) bond length is 2.43 Å. The Fe(5)-Fe(19) bond length is 2.75 Å. The Fe(5)-Fe(22) bond length is 2.73 Å. The Fe(5)-Fe(26) bond length is 2.63 Å. The Fe(5)-Fe(30) bond length is 2.50 Å. The Fe(5)-Fe(7) bond length is 2.47 Å. The Fe(5)-Si(1) bond length is 2.61 Å. The Fe(5)-Si(3) bond length is 2.51 Å. In the sixth Fe site, Fe(6) is bonded in a 12-coordinate geometry to one Sm(2), one Sm(4), one Fe(11), one Fe(14), one Fe(16), one Fe(20), one Fe(21), one Fe(23), one Fe(27), one Fe(31), one Fe(8), and one Si(2) atom. The Fe(6)-Fe(11) bond length is 2.48 Å. The Fe(6)-Fe(14) bond length is 2.43 Å. The Fe(6)-Fe(16) bond length is 2.43 Å. The Fe(6)-Fe(20) bond length is 2.75 Å. The Fe(6)-Fe(21) bond length is 2.76 Å. The Fe(6)-Fe(23) bond length is 2.53 Å. The Fe(6)-Fe(27) bond length is 2.63 Å. The Fe(6)-Fe(31) bond length is 2.51 Å. The Fe(6)-Fe(8) bond length is 2.48 Å. The Fe(6)-Si(2) bond length is 2.63 Å. In the seventh Fe site, Fe(7) is bonded in a 12-coordinate geometry to one Sm(1), one Sm(3), one Fe(1), one Fe(13), one Fe(18), one Fe(19), one Fe(22), one Fe(24), one Fe(26), one Fe(30), one Fe(5), and one Si(3) atom. The Fe(7)-Fe(13) bond length is 2.42 Å. The Fe(7)-Fe(18) bond length is 2.41 Å. The Fe(7)-Fe(19) bond length is 2.75 Å. The Fe(7)-Fe(22) bond length is 2.73 Å. The Fe(7)-Fe(24) bond length is 2.61 Å. The Fe(7)-Fe(26) bond length is 2.52 Å. The Fe(7)-Fe(30) bond length is 2.62 Å. The Fe(7)-Si(3) bond length is 2.50 Å. In the eighth Fe site, Fe(8) is bonded in a 12-coordinate geometry to one Sm(2), one Sm(4), one Fe(14), one Fe(17), one Fe(2), one Fe(20), one Fe(21), one Fe(23), one Fe(25), one Fe(27), one Fe(31), and one Fe(6) atom. The Fe(8)-Fe(14) bond length is 2.43 Å. The Fe(8)-Fe(17) bond length is 2.42 Å. The Fe(8)-Fe(20) bond length is 2.74 Å. The Fe(8)-Fe(21) bond length is 2.75 Å. The Fe(8)-Fe(23) bond length is 2.52 Å. The Fe(8)-Fe(25) bond length is 2.64 Å. The Fe(8)-Fe(27) bond length is 2.52 Å. The Fe(8)-Fe(31) bond length is 2.61 Å. In the ninth Fe site, Fe(9) is bonded in a 12-coordinate geometry to one Sm(1), one Sm(3), one Fe(13), one Fe(16), one Fe(2), one Fe(20), one Fe(21), one Fe(24), one Fe(26), one Fe(28), one Fe(3), and one Si(1) atom. The Fe(9)-Fe(13) bond length is 2.43 Å. The Fe(9)-Fe(16) bond length is 2.42 Å. The Fe(9)-Fe(20) bond length is 2.76 Å. The Fe(9)-Fe(21) bond length is 2.76 Å. The Fe(9)-Fe(24) bond length is 2.52 Å. The Fe(9)-Fe(26) bond length is 2.63 Å. The Fe(9)-Fe(28) bond length is 2.51 Å. The Fe(9)-Si(1) bond length is 2.62 Å. In the tenth Fe site, Fe(10) is bonded in a 12-coordinate geometry to one Sm(2), one Sm(4), one Fe(1), one Fe(14), one Fe(15), one Fe(19), one Fe(22), one Fe(25), one Fe(27), one Fe(29), one Fe(4), and one Si(2) atom. The Fe(10)-Fe(14) bond length is 2.42 Å. The Fe(10)-Fe(15) bond length is 2.43 Å. The Fe(10)-Fe(19) bond length is 2.74 Å. The Fe(10)-Fe(22) bond length is 2.76 Å. The Fe(10)-Fe(25) bond length is 2.52 Å. The Fe(10)-Fe(27) bond length is 2.63 Å. The Fe(10)-Fe(29) bond length is 2.49 Å. The Fe(10)-Si(2) bond length is 2.62 Å. In the eleventh Fe site, Fe(11) is bonded in a 12-coordinate geometry to one Sm(2), one Sm(3), one Fe(16), one Fe(17), one Fe(20), one Fe(21), one Fe(23), one Fe(28), one Fe(3), one Fe(31), one Fe(6), and one Si(1) atom. The Fe(11)-Fe(16) bond length is 2.42 Å. The Fe(11)-Fe(17) bond length is 2.42 Å. The Fe(11)-Fe(20) bond length is 2.75 Å. The Fe(11)-Fe(21) bond length is 2.73 Å. The Fe(11)-Fe(23) bond length is 2.62 Å. The Fe(11)-Fe(28) bond length is 2.63 Å. The Fe(11)-Fe(31) bond length is 2.53 Å. The Fe(11)-Si(1) bond length is 2.51 Å. In the twelfth Fe site, Fe(12) is bonded in a 12-coordinate geometry to one Sm(1), one Sm(4), one Fe(15), one Fe(18), one Fe(19), one Fe(22), one Fe(29), one Fe(30), one Fe(4), one Fe(5), one Si(2), and one Si(3) atom. The Fe(12)-Fe(15) bond length is 2.43 Å. The Fe(12)-Fe(18) bond length is 2.42 Å. The Fe(12)-Fe(19) bond length is 2.75 Å. The Fe(12)-Fe(22) bond length is 2.74 Å. The Fe(12)-Fe(29) bond length is 2.63 Å. The Fe(12)-Fe(30) bond length is 2.50 Å. The Fe(12)-Si(2) bond length is 2.51 Å. The Fe(12)-Si(3) bond length is 2.61 Å. In the thirteenth Fe site, Fe(13) is bonded to one Sm(1), one Sm(3), one Fe(19), one Fe(21), one Fe(24), one Fe(26), one Fe(3), one Fe(30), one Fe(5), one Fe(7), one Fe(9), and one Si(1) atom to form distorted FeSm2Fe9Si cuboctahedra that share  a cornercorner with one Fe(17)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(16)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(18)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a cornercorner with one Fe(26)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(24)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(1)Sm3Fe9 cuboctahedra, corners with three equivalent Fe(28)Sm3Fe8Si cuboctahedra, corners with three equivalent Si(3)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(30)Sm3Fe7Si2 cuboctahedra,  an edgeedge with one Fe(26)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(29)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(24)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(1)Sm3Fe9 cuboctahedra,  a faceface with one Fe(17)Sm2Fe10 cuboctahedra,  a faceface with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a faceface with one Fe(16)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(18)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Si(1)Sm3Fe9 cuboctahedra, and  a faceface with one Si(3)Sm3Fe9 cuboctahedra. The Fe(13)-Fe(19) bond length is 2.60 Å. The Fe(13)-Fe(21) bond length is 2.57 Å. The Fe(13)-Fe(24) bond length is 2.42 Å. The Fe(13)-Fe(26) bond length is 2.46 Å. The Fe(13)-Fe(30) bond length is 2.43 Å. The Fe(13)-Si(1) bond length is 2.41 Å. In the fourteenth Fe site, Fe(14) is bonded to one Sm(2), one Sm(4), one Fe(10), one Fe(20), one Fe(22), one Fe(25), one Fe(27), one Fe(31), one Fe(4), one Fe(6), one Fe(8), and one Si(2) atom to form distorted FeSm2Fe9Si cuboctahedra that share  a cornercorner with one Fe(17)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(16)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(18)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(31)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(25)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(27)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(2)Sm3Fe9 cuboctahedra, corners with three equivalent Fe(29)Sm3Fe8Si cuboctahedra, corners with three equivalent Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(28)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(31)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(25)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(27)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(2)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(3)Sm3Fe9 cuboctahedra,  a faceface with one Fe(17)Sm2Fe10 cuboctahedra,  a faceface with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a faceface with one Fe(16)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(18)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Fe(27)Sm3Fe9 cuboctahedra, and  a faceface with one Si(2)Sm3Fe9 cuboctahedra. The Fe(14)-Fe(20) bond length is 2.62 Å. The Fe(14)-Fe(22) bond length is 2.58 Å. The Fe(14)-Fe(25) bond length is 2.43 Å. The Fe(14)-Fe(27) bond length is 2.46 Å. The Fe(14)-Fe(31) bond length is 2.45 Å. The Fe(14)-Si(2) bond length is 2.42 Å. In the fifteenth Fe site, Fe(15) is bonded to one Sm(1), one Sm(4), one Fe(1), one Fe(10), one Fe(12), one Fe(19), one Fe(22), one Fe(26), one Fe(29), one Fe(5), one Si(2), and one Si(3) atom to form distorted FeSm2Fe8Si2 cuboctahedra that share  a cornercorner with one Fe(13)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(14)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a cornercorner with one Fe(26)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(28)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(23)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(25)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(2)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(18)Sm2Fe9Si cuboctahedra, corners with two equivalent Fe(31)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(24)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(30)Sm3Fe7Si2 cuboctahedra,  an edgeedge with one Fe(29)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(25)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(27)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(1)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(3)Sm3Fe9 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Si(2)Sm3Fe9 cuboctahedra,  a faceface with one Si(3)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(18)Sm2Fe9Si cuboctahedra. The Fe(15)-Fe(19) bond length is 2.62 Å. The Fe(15)-Fe(22) bond length is 2.56 Å. The Fe(15)-Fe(26) bond length is 2.44 Å. The Fe(15)-Fe(29) bond length is 2.44 Å. The Fe(15)-Si(2) bond length is 2.40 Å. The Fe(15)-Si(3) bond length is 2.41 Å. In the sixteenth Fe site, Fe(16) is bonded to one Sm(2), one Sm(3), one Fe(11), one Fe(2), one Fe(20), one Fe(21), one Fe(23), one Fe(27), one Fe(28), one Fe(6), one Fe(9), and one Si(1) atom to form distorted FeSm2Fe9Si cuboctahedra that share  a cornercorner with one Fe(13)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(14)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(29)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(31)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(24)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(27)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(1)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(3)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(17)Sm2Fe10 cuboctahedra, corners with two equivalent Fe(30)Sm3Fe7Si2 cuboctahedra, corners with two equivalent Fe(25)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(26)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(28)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(31)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(24)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(2)Sm3Fe9 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Fe(27)Sm3Fe9 cuboctahedra,  a faceface with one Si(1)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(17)Sm2Fe10 cuboctahedra. The Fe(16)-Fe(20) bond length is 2.61 Å. The Fe(16)-Fe(21) bond length is 2.58 Å. The Fe(16)-Fe(23) bond length is 2.43 Å. The Fe(16)-Fe(27) bond length is 2.46 Å. The Fe(16)-Fe(28) bond length is 2.44 Å. The Fe(16)-Si(1) bond length is 2.42 Å. In the seventeenth Fe site, Fe(17) is bonded to one Sm(2), one Sm(3), one Fe(11), one Fe(2), one Fe(20), one Fe(21), one Fe(23), one Fe(24), one Fe(28), one Fe(3), one Fe(31), and one Fe(8) atom to form FeSm2Fe10 cuboctahedra that share  a cornercorner with one Fe(13)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(14)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(29)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(31)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(24)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(27)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(1)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(3)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(16)Sm2Fe9Si cuboctahedra, corners with two equivalent Fe(26)Sm3Fe8Si cuboctahedra, corners with two equivalent Si(2)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(30)Sm3Fe7Si2 cuboctahedra,  an edgeedge with one Fe(28)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(25)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(27)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(1)Sm3Fe9 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Fe(27)Sm3Fe9 cuboctahedra,  a faceface with one Si(1)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(16)Sm2Fe9Si cuboctahedra. The Fe(17)-Fe(20) bond length is 2.60 Å. The Fe(17)-Fe(21) bond length is 2.60 Å. The Fe(17)-Fe(23) bond length is 2.44 Å. The Fe(17)-Fe(24) bond length is 2.45 Å. The Fe(17)-Fe(28) bond length is 2.45 Å. The Fe(17)-Fe(31) bond length is 2.45 Å. In the eighteenth Fe site, Fe(18) is bonded to one Sm(1), one Sm(4), one Fe(1), one Fe(12), one Fe(19), one Fe(22), one Fe(25), one Fe(29), one Fe(30), one Fe(4), one Fe(7), and one Si(3) atom to form distorted FeSm2Fe9Si cuboctahedra that share  a cornercorner with one Fe(13)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(14)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a cornercorner with one Fe(26)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(28)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(23)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(25)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(2)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(15)Sm2Fe8Si2 cuboctahedra, corners with two equivalent Fe(27)Sm3Fe9 cuboctahedra, corners with two equivalent Si(1)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(26)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(29)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(31)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(24)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(2)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(3)Sm3Fe9 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Si(2)Sm3Fe9 cuboctahedra,  a faceface with one Si(3)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(15)Sm2Fe8Si2 cuboctahedra. The Fe(18)-Fe(19) bond length is 2.61 Å. The Fe(18)-Fe(22) bond length is 2.57 Å. The Fe(18)-Fe(25) bond length is 2.42 Å. The Fe(18)-Fe(29) bond length is 2.47 Å. The Fe(18)-Fe(30) bond length is 2.43 Å. The Fe(18)-Si(3) bond length is 2.41 Å. In the nineteenth Fe site, Fe(19) is bonded in a 14-coordinate geometry to one Sm(1), one Fe(1), one Fe(10), one Fe(12), one Fe(13), one Fe(15), one Fe(18), one Fe(22), one Fe(26), one Fe(29), one Fe(30), one Fe(4), one Fe(5), and one Fe(7) atom. The Fe(19)-Fe(22) bond length is 2.36 Å. The Fe(19)-Fe(26) bond length is 2.62 Å. The Fe(19)-Fe(29) bond length is 2.61 Å. The Fe(19)-Fe(30) bond length is 2.61 Å. In the twentieth Fe site, Fe(20) is bonded in a 14-coordinate geometry to one Sm(2), one Fe(11), one Fe(14), one Fe(16), one Fe(17), one Fe(2), one Fe(21), one Fe(27), one Fe(28), one Fe(3), one Fe(31), one Fe(6), one Fe(8), and one Fe(9) atom. The Fe(20)-Fe(21) bond length is 2.37 Å. The Fe(20)-Fe(27) bond length is 2.62 Å. The Fe(20)-Fe(28) bond length is 2.63 Å. The Fe(20)-Fe(31) bond length is 2.63 Å. In the twenty-first Fe site, Fe(21) is bonded in a 14-coordinate geometry to one Sm(3), one Fe(11), one Fe(13), one Fe(16), one Fe(17), one Fe(2), one Fe(20), one Fe(23), one Fe(24), one Fe(3), one Fe(6), one Fe(8), one Fe(9), and one Si(1) atom. The Fe(21)-Fe(23) bond length is 2.63 Å. The Fe(21)-Fe(24) bond length is 2.63 Å. The Fe(21)-Si(1) bond length is 2.60 Å. In the twenty-second Fe site, Fe(22) is bonded in a 14-coordinate geometry to one Sm(4), one Fe(1), one Fe(10), one Fe(12), one Fe(14), one Fe(15), one Fe(18), one Fe(19), one Fe(25), one Fe(4), one Fe(5), one Fe(7), one Si(2), and one Si(3) atom. The Fe(22)-Fe(25) bond length is 2.64 Å. The Fe(22)-Si(2) bond length is 2.59 Å. The Fe(22)-Si(3) bond length is 2.59 Å. In the twenty-third Fe site, Fe(23) is bonded to one Sm(2), one Sm(3), one Sm(4), one Fe(11), one Fe(16), one Fe(17), one Fe(2), one Fe(21), one Fe(27), one Fe(31), one Fe(6), and one Fe(8) atom to form FeSm3Fe9 cuboctahedra that share  a cornercorner with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(18)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a cornercorner with one Fe(26)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(28)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(31)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(27)Sm3Fe9 cuboctahedra, corners with two equivalent Si(3)Sm3Fe9 cuboctahedra, corners with three equivalent Fe(14)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(17)Sm2Fe10 cuboctahedra,  an edgeedge with one Fe(13)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(16)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(29)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(24)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(25)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(1)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(2)Sm3Fe9 cuboctahedra,  a faceface with one Fe(17)Sm2Fe10 cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(16)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Fe(27)Sm3Fe9 cuboctahedra,  a faceface with one Si(1)Sm3Fe9 cuboctahedra, and  a faceface with one Si(2)Sm3Fe9 cuboctahedra. The Fe(23)-Fe(27) bond length is 2.46 Å. The Fe(23)-Fe(31) bond length is 2.47 Å. In the twenty-fourth Fe site, Fe(24) is bonded to one Sm(1), two equivalent Sm(3), one Fe(13), one Fe(17), one Fe(2), one Fe(21), one Fe(26), one Fe(28), one Fe(3), one Fe(7), and one Fe(9) atom to form FeSm3Fe9 cuboctahedra that share  a cornercorner with one Fe(17)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(13)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(16)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a cornercorner with one Fe(29)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(31)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(27)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(15)Sm2Fe8Si2 cuboctahedra, corners with two equivalent Fe(26)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(28)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(24)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(13)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(16)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(18)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(30)Sm3Fe7Si2 cuboctahedra,  an edgeedge with one Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(3)Sm3Fe9 cuboctahedra, edges with two equivalent Si(1)Sm3Fe9 cuboctahedra,  a faceface with one Fe(17)Sm2Fe10 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(16)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Si(3)Sm3Fe9 cuboctahedra, and faces with two equivalent Si(1)Sm3Fe9 cuboctahedra. The Fe(24)-Fe(26) bond length is 2.45 Å. The Fe(24)-Fe(28) bond length is 2.48 Å. In the twenty-fifth Fe site, Fe(25) is bonded to one Sm(2), two equivalent Sm(4), one Fe(1), one Fe(10), one Fe(14), one Fe(18), one Fe(22), one Fe(27), one Fe(29), one Fe(4), and one Fe(8) atom to form FeSm3Fe9 cuboctahedra that share  a cornercorner with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(14)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(18)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a cornercorner with one Fe(26)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(28)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(31)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(16)Sm2Fe9Si cuboctahedra, corners with two equivalent Fe(29)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(25)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(27)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(17)Sm2Fe10 cuboctahedra,  an edgeedge with one Fe(15)Sm2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(14)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(31)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(3)Sm3Fe9 cuboctahedra, edges with two equivalent Si(2)Sm3Fe9 cuboctahedra,  a faceface with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(18)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Fe(27)Sm3Fe9 cuboctahedra,  a faceface with one Si(3)Sm3Fe9 cuboctahedra, and faces with two equivalent Si(2)Sm3Fe9 cuboctahedra. The Fe(25)-Fe(27) bond length is 2.47 Å. The Fe(25)-Fe(29) bond length is 2.46 Å. In the twenty-sixth Fe site, Fe(26) is bonded to one Sm(3), two equivalent Sm(1), one Fe(1), one Fe(13), one Fe(15), one Fe(19), one Fe(24), one Fe(5), one Fe(7), one Fe(9), and one Si(3) atom to form FeSm3Fe8Si cuboctahedra that share  a cornercorner with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(13)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(18)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(23)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(25)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(1)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(2)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(17)Sm2Fe10 cuboctahedra, corners with two equivalent Fe(26)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(24)Sm3Fe9 cuboctahedra, corners with two equivalent Si(3)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(13)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(16)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(18)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(28)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(29)Sm3Fe8Si cuboctahedra,  an edgeedge with one Si(1)Sm3Fe9 cuboctahedra, edges with two equivalent Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(18)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Si(1)Sm3Fe9 cuboctahedra,  a faceface with one Si(3)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(30)Sm3Fe7Si2 cuboctahedra. The Fe(26)-Si(3) bond length is 2.46 Å. In the twenty-seventh Fe site, Fe(27) is bonded to one Sm(4), two equivalent Sm(2), one Fe(10), one Fe(14), one Fe(16), one Fe(2), one Fe(20), one Fe(23), one Fe(25), one Fe(6), and one Fe(8) atom to form FeSm3Fe9 cuboctahedra that share  a cornercorner with one Fe(17)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(14)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(16)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(24)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(1)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(2)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(3)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(18)Sm2Fe9Si cuboctahedra, corners with two equivalent Fe(23)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(25)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(27)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(17)Sm2Fe10 cuboctahedra,  an edgeedge with one Fe(15)Sm2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(14)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(28)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(29)Sm3Fe8Si cuboctahedra,  an edgeedge with one Si(2)Sm3Fe9 cuboctahedra, edges with two equivalent Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(17)Sm2Fe10 cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(16)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Si(2)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(31)Sm3Fe8Si cuboctahedra. In the twenty-eighth Fe site, Fe(28) is bonded to one Sm(1), one Sm(2), one Sm(3), one Fe(11), one Fe(16), one Fe(17), one Fe(2), one Fe(20), one Fe(24), one Fe(3), one Fe(9), and one Si(1) atom to form distorted FeSm3Fe8Si cuboctahedra that share  a cornercorner with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(18)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(25)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(2)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(29)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(23)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(24)Sm3Fe9 cuboctahedra, corners with two equivalent Si(1)Sm3Fe9 cuboctahedra, corners with three equivalent Fe(13)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(17)Sm2Fe10 cuboctahedra,  an edgeedge with one Fe(14)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(16)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(30)Sm3Fe7Si2 cuboctahedra,  an edgeedge with one Fe(26)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(31)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(27)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(3)Sm3Fe9 cuboctahedra,  a faceface with one Fe(17)Sm2Fe10 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(16)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Fe(27)Sm3Fe9 cuboctahedra, and  a faceface with one Si(1)Sm3Fe9 cuboctahedra. The Fe(28)-Si(1) bond length is 2.47 Å. In the twenty-ninth Fe site, Fe(29) is bonded to one Sm(1), one Sm(2), one Sm(4), one Fe(1), one Fe(10), one Fe(12), one Fe(15), one Fe(18), one Fe(19), one Fe(25), one Fe(4), and one Si(2) atom to form FeSm3Fe8Si cuboctahedra that share  a cornercorner with one Fe(17)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(16)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(24)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(1)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(28)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(25)Sm3Fe9 cuboctahedra, corners with two equivalent Si(2)Sm3Fe9 cuboctahedra, corners with two equivalent Si(3)Sm3Fe9 cuboctahedra, corners with three equivalent Fe(14)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(15)Sm2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(13)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(18)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(30)Sm3Fe7Si2 cuboctahedra,  an edgeedge with one Fe(26)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(31)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(27)Sm3Fe9 cuboctahedra,  a faceface with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(18)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Fe(27)Sm3Fe9 cuboctahedra,  a faceface with one Si(2)Sm3Fe9 cuboctahedra, and  a faceface with one Si(3)Sm3Fe9 cuboctahedra. The Fe(29)-Si(2) bond length is 2.46 Å. In the thirtieth Fe site, Fe(30) is bonded to one Sm(3), two equivalent Sm(1), one Fe(12), one Fe(13), one Fe(18), one Fe(19), one Fe(3), one Fe(5), one Fe(7), one Si(1), and one Si(3) atom to form distorted FeSm3Fe7Si2 cuboctahedra that share  a cornercorner with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(13)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(18)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(23)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(24)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(25)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(2)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(16)Sm2Fe9Si cuboctahedra, corners with two equivalent Fe(30)Sm3Fe7Si2 cuboctahedra, corners with two equivalent Si(1)Sm3Fe9 cuboctahedra, corners with two equivalent Si(3)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(17)Sm2Fe10 cuboctahedra,  an edgeedge with one Fe(15)Sm2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(13)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(28)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(29)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(24)Sm3Fe9 cuboctahedra, edges with two equivalent Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(18)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Si(1)Sm3Fe9 cuboctahedra,  a faceface with one Si(3)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(26)Sm3Fe8Si cuboctahedra. The Fe(30)-Si(1) bond length is 2.47 Å. The Fe(30)-Si(3) bond length is 2.48 Å. In the thirty-first Fe site, Fe(31) is bonded to one Sm(4), two equivalent Sm(2), one Fe(11), one Fe(14), one Fe(17), one Fe(20), one Fe(23), one Fe(4), one Fe(6), one Fe(8), and one Si(2) atom to form distorted FeSm3Fe8Si cuboctahedra that share  a cornercorner with one Fe(17)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(14)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(16)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(24)Sm3Fe9 cuboctahedra,  a cornercorner with one Fe(25)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(1)Sm3Fe9 cuboctahedra,  a cornercorner with one Si(3)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(15)Sm2Fe8Si2 cuboctahedra, corners with two equivalent Fe(31)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(23)Sm3Fe9 cuboctahedra, corners with two equivalent Si(2)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(14)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(16)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(18)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(28)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(29)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(25)Sm3Fe9 cuboctahedra, edges with two equivalent Fe(27)Sm3Fe9 cuboctahedra,  a faceface with one Fe(17)Sm2Fe10 cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(16)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Si(2)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(27)Sm3Fe9 cuboctahedra. The Fe(31)-Si(2) bond length is 2.48 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one Sm(1), two equivalent Sm(3), one Fe(11), one Fe(13), one Fe(16), one Fe(21), one Fe(28), one Fe(3), one Fe(30), one Fe(5), and one Fe(9) atom to form SiSm3Fe9 cuboctahedra that share  a cornercorner with one Fe(17)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(13)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(16)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(26)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(29)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(31)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(27)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(18)Sm2Fe9Si cuboctahedra, corners with two equivalent Fe(30)Sm3Fe7Si2 cuboctahedra, corners with two equivalent Fe(28)Sm3Fe8Si cuboctahedra, corners with two equivalent Si(1)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(17)Sm2Fe10 cuboctahedra,  an edgeedge with one Fe(15)Sm2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(13)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(26)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(3)Sm3Fe9 cuboctahedra, edges with two equivalent Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Fe(17)Sm2Fe10 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(16)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(28)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Si(3)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(24)Sm3Fe9 cuboctahedra. In the second Si site, Si(2) is bonded to one Sm(2), two equivalent Sm(4), one Fe(10), one Fe(12), one Fe(14), one Fe(15), one Fe(22), one Fe(29), one Fe(31), one Fe(4), and one Fe(6) atom to form distorted SiSm3Fe9 cuboctahedra that share  a cornercorner with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a cornercorner with one Fe(14)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(18)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a cornercorner with one Fe(26)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(28)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(27)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(17)Sm2Fe10 cuboctahedra, corners with two equivalent Fe(29)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(31)Sm3Fe8Si cuboctahedra, corners with two equivalent Si(2)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(14)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(16)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(18)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(23)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(27)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(3)Sm3Fe9 cuboctahedra, edges with two equivalent Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a faceface with one Fe(14)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(18)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(31)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(23)Sm3Fe9 cuboctahedra,  a faceface with one Fe(27)Sm3Fe9 cuboctahedra,  a faceface with one Si(3)Sm3Fe9 cuboctahedra, and faces with two equivalent Fe(25)Sm3Fe9 cuboctahedra. In the third Si site, Si(3) is bonded to one Sm(1), one Sm(3), one Sm(4), one Fe(1), one Fe(12), one Fe(15), one Fe(18), one Fe(22), one Fe(26), one Fe(30), one Fe(5), and one Fe(7) atom to form distorted SiSm3Fe9 cuboctahedra that share  a cornercorner with one Fe(17)Sm2Fe10 cuboctahedra,  a cornercorner with one Fe(16)Sm2Fe9Si cuboctahedra,  a cornercorner with one Fe(31)Sm3Fe8Si cuboctahedra,  a cornercorner with one Fe(27)Sm3Fe9 cuboctahedra, corners with two equivalent Fe(30)Sm3Fe7Si2 cuboctahedra, corners with two equivalent Fe(26)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(29)Sm3Fe8Si cuboctahedra, corners with two equivalent Fe(23)Sm3Fe9 cuboctahedra, corners with three equivalent Fe(13)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(15)Sm2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(14)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(18)Sm2Fe9Si cuboctahedra,  an edgeedge with one Fe(28)Sm3Fe8Si cuboctahedra,  an edgeedge with one Fe(24)Sm3Fe9 cuboctahedra,  an edgeedge with one Fe(25)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(1)Sm3Fe9 cuboctahedra,  an edgeedge with one Si(2)Sm3Fe9 cuboctahedra,  a faceface with one Fe(15)Sm2Fe8Si2 cuboctahedra,  a faceface with one Fe(13)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(18)Sm2Fe9Si cuboctahedra,  a faceface with one Fe(30)Sm3Fe7Si2 cuboctahedra,  a faceface with one Fe(26)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(29)Sm3Fe8Si cuboctahedra,  a faceface with one Fe(24)Sm3Fe9 cuboctahedra,  a faceface with one Fe(25)Sm3Fe9 cuboctahedra,  a faceface with one Si(1)Sm3Fe9 cuboctahedra, and  a faceface with one Si(2)Sm3Fe9 cuboctahedra.