ErSm(TiFe11)2 crystallizes in the monoclinic Cm space group. Er(1) is bonded in a 20-coordinate geometry to one Ti(2), one Fe(14), one Fe(15), one Fe(17), two equivalent Fe(1), two equivalent Fe(10), two equivalent Fe(4), two equivalent Fe(6), two equivalent Fe(7), two equivalent Fe(9), and four equivalent Fe(12) atoms. Sm(1) is bonded in a 20-coordinate geometry to one Ti(1), one Fe(13), one Fe(16), one Fe(18), two equivalent Fe(10), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(8), two equivalent Fe(9), and four equivalent Fe(11) atoms. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded in a 14-coordinate geometry to one Sm(1), one Fe(1), one Fe(17), one Fe(3), two equivalent Fe(11), two equivalent Fe(13), two equivalent Fe(15), two equivalent Fe(5), and two equivalent Fe(9) atoms. In the second Ti site, Ti(2) is bonded in a 14-coordinate geometry to one Er(1), one Fe(18), one Fe(2), one Fe(4), two equivalent Fe(10), two equivalent Fe(12), two equivalent Fe(14), two equivalent Fe(16), and two equivalent Fe(6) atoms. There are eighteen inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to two equivalent Er(1), one Ti(1), one Fe(17), one Fe(6), one Fe(7), two equivalent Fe(12), two equivalent Fe(15), and two equivalent Fe(9) atoms. In the second Fe site, Fe(2) is bonded in a 12-coordinate geometry to two equivalent Sm(1), one Ti(2), one Fe(18), one Fe(5), one Fe(8), two equivalent Fe(10), two equivalent Fe(11), and two equivalent Fe(16) atoms. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to two equivalent Sm(1), one Ti(1), one Fe(17), one Fe(5), one Fe(8), two equivalent Fe(11), two equivalent Fe(13), and two equivalent Fe(9) atoms. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to two equivalent Er(1), one Ti(2), one Fe(18), one Fe(6), one Fe(7), two equivalent Fe(10), two equivalent Fe(12), and two equivalent Fe(14) atoms. In the fifth Fe site, Fe(5) is bonded in a 12-coordinate geometry to two equivalent Sm(1), two equivalent Ti(1), one Fe(13), one Fe(15), one Fe(2), one Fe(3), two equivalent Fe(11), and two equivalent Fe(9) atoms. In the sixth Fe site, Fe(6) is bonded in a 12-coordinate geometry to two equivalent Er(1), two equivalent Ti(2), one Fe(1), one Fe(14), one Fe(16), one Fe(4), two equivalent Fe(10), and two equivalent Fe(12) atoms. In the seventh Fe site, Fe(7) is bonded to two equivalent Er(1), one Fe(1), one Fe(13), one Fe(15), one Fe(4), two equivalent Fe(12), two equivalent Fe(17), and two equivalent Fe(9) atoms to form distorted FeEr2Fe10 cuboctahedra that share corners with two equivalent Fe(12)Er2TiFe9 cuboctahedra, corners with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, corners with two equivalent Fe(10)SmErTiFe9 cuboctahedra, corners with two equivalent Fe(9)SmErTiFe9 cuboctahedra, edges with two equivalent Fe(7)Er2Fe10 cuboctahedra, edges with two equivalent Fe(12)Er2TiFe9 cuboctahedra, edges with two equivalent Fe(10)SmErTiFe9 cuboctahedra, faces with four equivalent Fe(12)Er2TiFe9 cuboctahedra, and faces with four equivalent Fe(9)SmErTiFe9 cuboctahedra. In the eighth Fe site, Fe(8) is bonded to two equivalent Sm(1), one Fe(14), one Fe(16), one Fe(2), one Fe(3), two equivalent Fe(10), two equivalent Fe(11), and two equivalent Fe(18) atoms to form distorted FeSm2Fe10 cuboctahedra that share corners with two equivalent Fe(12)Er2TiFe9 cuboctahedra, corners with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, corners with two equivalent Fe(10)SmErTiFe9 cuboctahedra, corners with two equivalent Fe(9)SmErTiFe9 cuboctahedra, edges with two equivalent Fe(8)Sm2Fe10 cuboctahedra, edges with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, edges with two equivalent Fe(9)SmErTiFe9 cuboctahedra, faces with four equivalent Fe(11)Sm2TiFe9 cuboctahedra, and faces with four equivalent Fe(10)SmErTiFe9 cuboctahedra. In the ninth Fe site, Fe(9) is bonded to one Er(1), one Sm(1), one Ti(1), one Fe(1), one Fe(13), one Fe(15), one Fe(17), one Fe(3), one Fe(5), one Fe(7), and two equivalent Fe(9) atoms to form distorted FeSmErTiFe9 cuboctahedra that share  a cornercorner with one Fe(7)Er2Fe10 cuboctahedra,  a cornercorner with one Fe(8)Sm2Fe10 cuboctahedra, corners with two equivalent Fe(12)Er2TiFe9 cuboctahedra, corners with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, corners with two equivalent Fe(9)SmErTiFe9 cuboctahedra, corners with four equivalent Fe(10)SmErTiFe9 cuboctahedra,  an edgeedge with one Fe(8)Sm2Fe10 cuboctahedra, edges with two equivalent Fe(12)Er2TiFe9 cuboctahedra, edges with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, faces with two equivalent Fe(7)Er2Fe10 cuboctahedra, faces with two equivalent Fe(12)Er2TiFe9 cuboctahedra, faces with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, and faces with two equivalent Fe(9)SmErTiFe9 cuboctahedra. In the tenth Fe site, Fe(10) is bonded to one Er(1), one Sm(1), one Ti(2), one Fe(14), one Fe(16), one Fe(18), one Fe(2), one Fe(4), one Fe(6), one Fe(8), and two equivalent Fe(10) atoms to form distorted FeSmErTiFe9 cuboctahedra that share  a cornercorner with one Fe(7)Er2Fe10 cuboctahedra,  a cornercorner with one Fe(8)Sm2Fe10 cuboctahedra, corners with two equivalent Fe(12)Er2TiFe9 cuboctahedra, corners with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, corners with two equivalent Fe(10)SmErTiFe9 cuboctahedra, corners with four equivalent Fe(9)SmErTiFe9 cuboctahedra,  an edgeedge with one Fe(7)Er2Fe10 cuboctahedra, edges with two equivalent Fe(12)Er2TiFe9 cuboctahedra, edges with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, faces with two equivalent Fe(12)Er2TiFe9 cuboctahedra, faces with two equivalent Fe(8)Sm2Fe10 cuboctahedra, faces with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, and faces with two equivalent Fe(10)SmErTiFe9 cuboctahedra. In the eleventh Fe site, Fe(11) is bonded to two equivalent Sm(1), one Ti(1), one Fe(13), one Fe(16), one Fe(18), one Fe(2), one Fe(3), one Fe(5), one Fe(8), and two equivalent Fe(11) atoms to form distorted FeSm2TiFe9 cuboctahedra that share  a cornercorner with one Fe(7)Er2Fe10 cuboctahedra,  a cornercorner with one Fe(8)Sm2Fe10 cuboctahedra, corners with two equivalent Fe(10)SmErTiFe9 cuboctahedra, corners with two equivalent Fe(9)SmErTiFe9 cuboctahedra, corners with six equivalent Fe(11)Sm2TiFe9 cuboctahedra,  an edgeedge with one Fe(8)Sm2Fe10 cuboctahedra, edges with two equivalent Fe(10)SmErTiFe9 cuboctahedra, edges with two equivalent Fe(9)SmErTiFe9 cuboctahedra, faces with two equivalent Fe(8)Sm2Fe10 cuboctahedra, faces with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, faces with two equivalent Fe(10)SmErTiFe9 cuboctahedra, and faces with two equivalent Fe(9)SmErTiFe9 cuboctahedra. In the twelfth Fe site, Fe(12) is bonded to two equivalent Er(1), one Ti(2), one Fe(1), one Fe(14), one Fe(15), one Fe(17), one Fe(4), one Fe(6), one Fe(7), and two equivalent Fe(12) atoms to form distorted FeEr2TiFe9 cuboctahedra that share  a cornercorner with one Fe(7)Er2Fe10 cuboctahedra,  a cornercorner with one Fe(8)Sm2Fe10 cuboctahedra, corners with two equivalent Fe(10)SmErTiFe9 cuboctahedra, corners with two equivalent Fe(9)SmErTiFe9 cuboctahedra, corners with six equivalent Fe(12)Er2TiFe9 cuboctahedra,  an edgeedge with one Fe(7)Er2Fe10 cuboctahedra, edges with two equivalent Fe(10)SmErTiFe9 cuboctahedra, edges with two equivalent Fe(9)SmErTiFe9 cuboctahedra, faces with two equivalent Fe(7)Er2Fe10 cuboctahedra, faces with two equivalent Fe(12)Er2TiFe9 cuboctahedra, faces with two equivalent Fe(10)SmErTiFe9 cuboctahedra, and faces with two equivalent Fe(9)SmErTiFe9 cuboctahedra. In the thirteenth Fe site, Fe(13) is bonded in a 14-coordinate geometry to one Sm(1), two equivalent Ti(1), one Fe(15), one Fe(5), one Fe(7), two equivalent Fe(11), two equivalent Fe(17), two equivalent Fe(3), and two equivalent Fe(9) atoms. In the fourteenth Fe site, Fe(14) is bonded in a 14-coordinate geometry to one Er(1), two equivalent Ti(2), one Fe(16), one Fe(6), one Fe(8), two equivalent Fe(10), two equivalent Fe(12), two equivalent Fe(18), and two equivalent Fe(4) atoms. In the fifteenth Fe site, Fe(15) is bonded in a 14-coordinate geometry to one Er(1), two equivalent Ti(1), one Fe(13), one Fe(5), one Fe(7), two equivalent Fe(1), two equivalent Fe(12), two equivalent Fe(17), and two equivalent Fe(9) atoms. In the sixteenth Fe site, Fe(16) is bonded in a 14-coordinate geometry to one Sm(1), two equivalent Ti(2), one Fe(14), one Fe(6), one Fe(8), two equivalent Fe(10), two equivalent Fe(11), two equivalent Fe(18), and two equivalent Fe(2) atoms. In the seventeenth Fe site, Fe(17) is bonded in a 1-coordinate geometry to one Er(1), one Ti(1), one Fe(1), one Fe(3), two equivalent Fe(12), two equivalent Fe(13), two equivalent Fe(15), two equivalent Fe(7), and two equivalent Fe(9) atoms. In the eighteenth Fe site, Fe(18) is bonded in a 1-coordinate geometry to one Sm(1), one Ti(2), one Fe(2), one Fe(4), two equivalent Fe(10), two equivalent Fe(11), two equivalent Fe(14), two equivalent Fe(16), and two equivalent Fe(8) atoms.
ErSm(TiFe11)2 crystallizes in the monoclinic Cm space group. Er(1) is bonded in a 20-coordinate geometry to one Ti(2), one Fe(14), one Fe(15), one Fe(17), two equivalent Fe(1), two equivalent Fe(10), two equivalent Fe(4), two equivalent Fe(6), two equivalent Fe(7), two equivalent Fe(9), and four equivalent Fe(12) atoms. The Er(1)-Ti(2) bond length is 3.17 Å. The Er(1)-Fe(14) bond length is 3.02 Å. The Er(1)-Fe(15) bond length is 3.02 Å. The Er(1)-Fe(17) bond length is 2.95 Å. Both Er(1)-Fe(1) bond lengths are 3.00 Å. Both Er(1)-Fe(10) bond lengths are 3.25 Å. Both Er(1)-Fe(4) bond lengths are 3.00 Å. Both Er(1)-Fe(6) bond lengths are 3.06 Å. Both Er(1)-Fe(7) bond lengths are 3.03 Å. Both Er(1)-Fe(9) bond lengths are 3.17 Å. There are two shorter (3.20 Å) and two longer (3.26 Å) Er(1)-Fe(12) bond lengths. Sm(1) is bonded in a 20-coordinate geometry to one Ti(1), one Fe(13), one Fe(16), one Fe(18), two equivalent Fe(10), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(8), two equivalent Fe(9), and four equivalent Fe(11) atoms. The Sm(1)-Ti(1) bond length is 3.18 Å. The Sm(1)-Fe(13) bond length is 3.04 Å. The Sm(1)-Fe(16) bond length is 3.05 Å. The Sm(1)-Fe(18) bond length is 2.98 Å. Both Sm(1)-Fe(10) bond lengths are 3.22 Å. Both Sm(1)-Fe(2) bond lengths are 3.03 Å. Both Sm(1)-Fe(3) bond lengths are 3.03 Å. Both Sm(1)-Fe(5) bond lengths are 3.08 Å. Both Sm(1)-Fe(8) bond lengths are 3.05 Å. Both Sm(1)-Fe(9) bond lengths are 3.27 Å. There are two shorter (3.19 Å) and two longer (3.26 Å) Sm(1)-Fe(11) bond lengths. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded in a 14-coordinate geometry to one Sm(1), one Fe(1), one Fe(17), one Fe(3), two equivalent Fe(11), two equivalent Fe(13), two equivalent Fe(15), two equivalent Fe(5), and two equivalent Fe(9) atoms. The Ti(1)-Fe(1) bond length is 2.62 Å. The Ti(1)-Fe(17) bond length is 2.36 Å. The Ti(1)-Fe(3) bond length is 2.61 Å. Both Ti(1)-Fe(11) bond lengths are 2.65 Å. Both Ti(1)-Fe(13) bond lengths are 2.88 Å. Both Ti(1)-Fe(15) bond lengths are 2.87 Å. Both Ti(1)-Fe(5) bond lengths are 2.64 Å. Both Ti(1)-Fe(9) bond lengths are 2.64 Å. In the second Ti site, Ti(2) is bonded in a 14-coordinate geometry to one Er(1), one Fe(18), one Fe(2), one Fe(4), two equivalent Fe(10), two equivalent Fe(12), two equivalent Fe(14), two equivalent Fe(16), and two equivalent Fe(6) atoms. The Ti(2)-Fe(18) bond length is 2.37 Å. The Ti(2)-Fe(2) bond length is 2.62 Å. The Ti(2)-Fe(4) bond length is 2.63 Å. Both Ti(2)-Fe(10) bond lengths are 2.64 Å. Both Ti(2)-Fe(12) bond lengths are 2.63 Å. Both Ti(2)-Fe(14) bond lengths are 2.88 Å. Both Ti(2)-Fe(16) bond lengths are 2.88 Å. Both Ti(2)-Fe(6) bond lengths are 2.65 Å. There are eighteen inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to two equivalent Er(1), one Ti(1), one Fe(17), one Fe(6), one Fe(7), two equivalent Fe(12), two equivalent Fe(15), and two equivalent Fe(9) atoms. The Fe(1)-Fe(17) bond length is 2.69 Å. The Fe(1)-Fe(6) bond length is 2.65 Å. The Fe(1)-Fe(7) bond length is 2.71 Å. Both Fe(1)-Fe(12) bond lengths are 2.42 Å. Both Fe(1)-Fe(15) bond lengths are 2.62 Å. Both Fe(1)-Fe(9) bond lengths are 2.45 Å. In the second Fe site, Fe(2) is bonded in a 12-coordinate geometry to two equivalent Sm(1), one Ti(2), one Fe(18), one Fe(5), one Fe(8), two equivalent Fe(10), two equivalent Fe(11), and two equivalent Fe(16) atoms. The Fe(2)-Fe(18) bond length is 2.65 Å. The Fe(2)-Fe(5) bond length is 2.72 Å. The Fe(2)-Fe(8) bond length is 2.75 Å. Both Fe(2)-Fe(10) bond lengths are 2.47 Å. Both Fe(2)-Fe(11) bond lengths are 2.43 Å. Both Fe(2)-Fe(16) bond lengths are 2.61 Å. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to two equivalent Sm(1), one Ti(1), one Fe(17), one Fe(5), one Fe(8), two equivalent Fe(11), two equivalent Fe(13), and two equivalent Fe(9) atoms. The Fe(3)-Fe(17) bond length is 2.64 Å. The Fe(3)-Fe(5) bond length is 2.71 Å. The Fe(3)-Fe(8) bond length is 2.77 Å. Both Fe(3)-Fe(11) bond lengths are 2.46 Å. Both Fe(3)-Fe(13) bond lengths are 2.61 Å. Both Fe(3)-Fe(9) bond lengths are 2.42 Å. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to two equivalent Er(1), one Ti(2), one Fe(18), one Fe(6), one Fe(7), two equivalent Fe(10), two equivalent Fe(12), and two equivalent Fe(14) atoms. The Fe(4)-Fe(18) bond length is 2.69 Å. The Fe(4)-Fe(6) bond length is 2.66 Å. The Fe(4)-Fe(7) bond length is 2.69 Å. Both Fe(4)-Fe(10) bond lengths are 2.43 Å. Both Fe(4)-Fe(12) bond lengths are 2.46 Å. Both Fe(4)-Fe(14) bond lengths are 2.62 Å. In the fifth Fe site, Fe(5) is bonded in a 12-coordinate geometry to two equivalent Sm(1), two equivalent Ti(1), one Fe(13), one Fe(15), one Fe(2), one Fe(3), two equivalent Fe(11), and two equivalent Fe(9) atoms. The Fe(5)-Fe(13) bond length is 2.62 Å. The Fe(5)-Fe(15) bond length is 2.61 Å. Both Fe(5)-Fe(11) bond lengths are 2.45 Å. Both Fe(5)-Fe(9) bond lengths are 2.44 Å. In the sixth Fe site, Fe(6) is bonded in a 12-coordinate geometry to two equivalent Er(1), two equivalent Ti(2), one Fe(1), one Fe(14), one Fe(16), one Fe(4), two equivalent Fe(10), and two equivalent Fe(12) atoms. The Fe(6)-Fe(14) bond length is 2.64 Å. The Fe(6)-Fe(16) bond length is 2.65 Å. Both Fe(6)-Fe(10) bond lengths are 2.44 Å. Both Fe(6)-Fe(12) bond lengths are 2.44 Å. In the seventh Fe site, Fe(7) is bonded to two equivalent Er(1), one Fe(1), one Fe(13), one Fe(15), one Fe(4), two equivalent Fe(12), two equivalent Fe(17), and two equivalent Fe(9) atoms to form distorted FeEr2Fe10 cuboctahedra that share corners with two equivalent Fe(12)Er2TiFe9 cuboctahedra, corners with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, corners with two equivalent Fe(10)SmErTiFe9 cuboctahedra, corners with two equivalent Fe(9)SmErTiFe9 cuboctahedra, edges with two equivalent Fe(7)Er2Fe10 cuboctahedra, edges with two equivalent Fe(12)Er2TiFe9 cuboctahedra, edges with two equivalent Fe(10)SmErTiFe9 cuboctahedra, faces with four equivalent Fe(12)Er2TiFe9 cuboctahedra, and faces with four equivalent Fe(9)SmErTiFe9 cuboctahedra. The Fe(7)-Fe(13) bond length is 2.59 Å. The Fe(7)-Fe(15) bond length is 2.61 Å. Both Fe(7)-Fe(12) bond lengths are 2.42 Å. Both Fe(7)-Fe(17) bond lengths are 2.57 Å. Both Fe(7)-Fe(9) bond lengths are 2.42 Å. In the eighth Fe site, Fe(8) is bonded to two equivalent Sm(1), one Fe(14), one Fe(16), one Fe(2), one Fe(3), two equivalent Fe(10), two equivalent Fe(11), and two equivalent Fe(18) atoms to form distorted FeSm2Fe10 cuboctahedra that share corners with two equivalent Fe(12)Er2TiFe9 cuboctahedra, corners with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, corners with two equivalent Fe(10)SmErTiFe9 cuboctahedra, corners with two equivalent Fe(9)SmErTiFe9 cuboctahedra, edges with two equivalent Fe(8)Sm2Fe10 cuboctahedra, edges with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, edges with two equivalent Fe(9)SmErTiFe9 cuboctahedra, faces with four equivalent Fe(11)Sm2TiFe9 cuboctahedra, and faces with four equivalent Fe(10)SmErTiFe9 cuboctahedra. The Fe(8)-Fe(14) bond length is 2.60 Å. The Fe(8)-Fe(16) bond length is 2.58 Å. Both Fe(8)-Fe(10) bond lengths are 2.43 Å. Both Fe(8)-Fe(11) bond lengths are 2.43 Å. Both Fe(8)-Fe(18) bond lengths are 2.57 Å. In the ninth Fe site, Fe(9) is bonded to one Er(1), one Sm(1), one Ti(1), one Fe(1), one Fe(13), one Fe(15), one Fe(17), one Fe(3), one Fe(5), one Fe(7), and two equivalent Fe(9) atoms to form distorted FeSmErTiFe9 cuboctahedra that share  a cornercorner with one Fe(7)Er2Fe10 cuboctahedra,  a cornercorner with one Fe(8)Sm2Fe10 cuboctahedra, corners with two equivalent Fe(12)Er2TiFe9 cuboctahedra, corners with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, corners with two equivalent Fe(9)SmErTiFe9 cuboctahedra, corners with four equivalent Fe(10)SmErTiFe9 cuboctahedra,  an edgeedge with one Fe(8)Sm2Fe10 cuboctahedra, edges with two equivalent Fe(12)Er2TiFe9 cuboctahedra, edges with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, faces with two equivalent Fe(7)Er2Fe10 cuboctahedra, faces with two equivalent Fe(12)Er2TiFe9 cuboctahedra, faces with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, and faces with two equivalent Fe(9)SmErTiFe9 cuboctahedra. The Fe(9)-Fe(13) bond length is 2.59 Å. The Fe(9)-Fe(15) bond length is 2.59 Å. The Fe(9)-Fe(17) bond length is 2.56 Å. There is one shorter (2.34 Å) and one longer (2.36 Å) Fe(9)-Fe(9) bond length. In the tenth Fe site, Fe(10) is bonded to one Er(1), one Sm(1), one Ti(2), one Fe(14), one Fe(16), one Fe(18), one Fe(2), one Fe(4), one Fe(6), one Fe(8), and two equivalent Fe(10) atoms to form distorted FeSmErTiFe9 cuboctahedra that share  a cornercorner with one Fe(7)Er2Fe10 cuboctahedra,  a cornercorner with one Fe(8)Sm2Fe10 cuboctahedra, corners with two equivalent Fe(12)Er2TiFe9 cuboctahedra, corners with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, corners with two equivalent Fe(10)SmErTiFe9 cuboctahedra, corners with four equivalent Fe(9)SmErTiFe9 cuboctahedra,  an edgeedge with one Fe(7)Er2Fe10 cuboctahedra, edges with two equivalent Fe(12)Er2TiFe9 cuboctahedra, edges with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, faces with two equivalent Fe(12)Er2TiFe9 cuboctahedra, faces with two equivalent Fe(8)Sm2Fe10 cuboctahedra, faces with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, and faces with two equivalent Fe(10)SmErTiFe9 cuboctahedra. The Fe(10)-Fe(14) bond length is 2.59 Å. The Fe(10)-Fe(16) bond length is 2.61 Å. The Fe(10)-Fe(18) bond length is 2.58 Å. Both Fe(10)-Fe(10) bond lengths are 2.35 Å. In the eleventh Fe site, Fe(11) is bonded to two equivalent Sm(1), one Ti(1), one Fe(13), one Fe(16), one Fe(18), one Fe(2), one Fe(3), one Fe(5), one Fe(8), and two equivalent Fe(11) atoms to form distorted FeSm2TiFe9 cuboctahedra that share  a cornercorner with one Fe(7)Er2Fe10 cuboctahedra,  a cornercorner with one Fe(8)Sm2Fe10 cuboctahedra, corners with two equivalent Fe(10)SmErTiFe9 cuboctahedra, corners with two equivalent Fe(9)SmErTiFe9 cuboctahedra, corners with six equivalent Fe(11)Sm2TiFe9 cuboctahedra,  an edgeedge with one Fe(8)Sm2Fe10 cuboctahedra, edges with two equivalent Fe(10)SmErTiFe9 cuboctahedra, edges with two equivalent Fe(9)SmErTiFe9 cuboctahedra, faces with two equivalent Fe(8)Sm2Fe10 cuboctahedra, faces with two equivalent Fe(11)Sm2TiFe9 cuboctahedra, faces with two equivalent Fe(10)SmErTiFe9 cuboctahedra, and faces with two equivalent Fe(9)SmErTiFe9 cuboctahedra. The Fe(11)-Fe(13) bond length is 2.60 Å. The Fe(11)-Fe(16) bond length is 2.60 Å. The Fe(11)-Fe(18) bond length is 2.58 Å. There is one shorter (2.35 Å) and one longer (2.36 Å) Fe(11)-Fe(11) bond length. In the twelfth Fe site, Fe(12) is bonded to two equivalent Er(1), one Ti(2), one Fe(1), one Fe(14), one Fe(15), one Fe(17), one Fe(4), one Fe(6), one Fe(7), and two equivalent Fe(12) atoms to form distorted FeEr2TiFe9 cuboctahedra that share  a cornercorner with one Fe(7)Er2Fe10 cuboctahedra,  a cornercorner with one Fe(8)Sm2Fe10 cuboctahedra, corners with two equivalent Fe(10)SmErTiFe9 cuboctahedra, corners with two equivalent Fe(9)SmErTiFe9 cuboctahedra, corners with six equivalent Fe(12)Er2TiFe9 cuboctahedra,  an edgeedge with one Fe(7)Er2Fe10 cuboctahedra, edges with two equivalent Fe(10)SmErTiFe9 cuboctahedra, edges with two equivalent Fe(9)SmErTiFe9 cuboctahedra, faces with two equivalent Fe(7)Er2Fe10 cuboctahedra, faces with two equivalent Fe(12)Er2TiFe9 cuboctahedra, faces with two equivalent Fe(10)SmErTiFe9 cuboctahedra, and faces with two equivalent Fe(9)SmErTiFe9 cuboctahedra. The Fe(12)-Fe(14) bond length is 2.59 Å. The Fe(12)-Fe(15) bond length is 2.57 Å. The Fe(12)-Fe(17) bond length is 2.56 Å. There is one shorter (2.35 Å) and one longer (2.36 Å) Fe(12)-Fe(12) bond length. In the thirteenth Fe site, Fe(13) is bonded in a 14-coordinate geometry to one Sm(1), two equivalent Ti(1), one Fe(15), one Fe(5), one Fe(7), two equivalent Fe(11), two equivalent Fe(17), two equivalent Fe(3), and two equivalent Fe(9) atoms. The Fe(13)-Fe(15) bond length is 2.43 Å. Both Fe(13)-Fe(17) bond lengths are 2.92 Å. In the fourteenth Fe site, Fe(14) is bonded in a 14-coordinate geometry to one Er(1), two equivalent Ti(2), one Fe(16), one Fe(6), one Fe(8), two equivalent Fe(10), two equivalent Fe(12), two equivalent Fe(18), and two equivalent Fe(4) atoms. The Fe(14)-Fe(16) bond length is 2.44 Å. Both Fe(14)-Fe(18) bond lengths are 2.94 Å. In the fifteenth Fe site, Fe(15) is bonded in a 14-coordinate geometry to one Er(1), two equivalent Ti(1), one Fe(13), one Fe(5), one Fe(7), two equivalent Fe(1), two equivalent Fe(12), two equivalent Fe(17), and two equivalent Fe(9) atoms. Both Fe(15)-Fe(17) bond lengths are 2.93 Å. In the sixteenth Fe site, Fe(16) is bonded in a 14-coordinate geometry to one Sm(1), two equivalent Ti(2), one Fe(14), one Fe(6), one Fe(8), two equivalent Fe(10), two equivalent Fe(11), two equivalent Fe(18), and two equivalent Fe(2) atoms. Both Fe(16)-Fe(18) bond lengths are 2.92 Å. In the seventeenth Fe site, Fe(17) is bonded in a 1-coordinate geometry to one Er(1), one Ti(1), one Fe(1), one Fe(3), two equivalent Fe(12), two equivalent Fe(13), two equivalent Fe(15), two equivalent Fe(7), and two equivalent Fe(9) atoms. In the eighteenth Fe site, Fe(18) is bonded in a 1-coordinate geometry to one Sm(1), one Ti(2), one Fe(2), one Fe(4), two equivalent Fe(10), two equivalent Fe(11), two equivalent Fe(14), two equivalent Fe(16), and two equivalent Fe(8) atoms.