Tb12Si5S28 crystallizes in the triclinic P1 space group. There are twelve inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 8-coordinate geometry to one S(1), one S(13), one S(17), one S(18), one S(25), one S(27), one S(6), and one S(8) atom. In the second Tb site, Tb(2) is bonded in a 7-coordinate geometry to one S(14), one S(18), one S(2), one S(26), one S(28), one S(5), and one S(7) atom. In the third Tb site, Tb(3) is bonded in a 7-coordinate geometry to one S(1), one S(10), one S(16), one S(19), one S(23), one S(28), and one S(8) atom. In the fourth Tb site, Tb(4) is bonded in a 8-coordinate geometry to one S(15), one S(19), one S(2), one S(20), one S(24), one S(27), one S(7), and one S(9) atom. In the fifth Tb site, Tb(5) is bonded in a 7-coordinate geometry to one S(1), one S(10), one S(11), one S(21), one S(23), one S(26), and one S(6) atom. In the sixth Tb site, Tb(6) is bonded in a 8-coordinate geometry to one S(12), one S(2), one S(21), one S(22), one S(24), one S(25), one S(5), and one S(9) atom. In the seventh Tb site, Tb(7) is bonded in a 8-coordinate geometry to one S(11), one S(13), one S(19), one S(21), one S(23), one S(24), one S(3), and one S(7) atom. In the eighth Tb site, Tb(8) is bonded in a 8-coordinate geometry to one S(12), one S(14), one S(20), one S(22), one S(23), one S(24), one S(4), and one S(8) atom. In the ninth Tb site, Tb(9) is bonded in a 8-coordinate geometry to one S(10), one S(13), one S(15), one S(17), one S(22), one S(25), one S(26), and one S(3) atom. In the tenth Tb site, Tb(10) is bonded in a 8-coordinate geometry to one S(14), one S(16), one S(18), one S(21), one S(25), one S(26), one S(4), and one S(9) atom. In the eleventh Tb site, Tb(11) is bonded in a 8-coordinate geometry to one S(11), one S(15), one S(17), one S(20), one S(27), one S(28), one S(3), and one S(5) atom. In the twelfth Tb site, Tb(12) is bonded in a 8-coordinate geometry to one S(12), one S(16), one S(18), one S(19), one S(27), one S(28), one S(4), and one S(6) atom. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one S(1), one S(5), one S(7), and one S(9) atom. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one S(10), one S(2), one S(6), and one S(8) atom. In the third Si site, Si(3) is bonded in a tetrahedral geometry to one S(11), one S(13), one S(15), and one S(4) atom. In the fourth Si site, Si(4) is bonded in a tetrahedral geometry to one S(12), one S(14), one S(16), and one S(3) atom. In the fifth Si site, Si(5) is bonded in an octahedral geometry to one S(17), one S(20), one S(22), one S(24), one S(25), and one S(27) atom. There are twenty-eight inequivalent S sites. In the first S site, S(1) is bonded to one Tb(1), one Tb(3), one Tb(5), and one Si(1) atom to form STb3Si tetrahedra that share  a cornercorner with one S(17)Tb3Si trigonal pyramid,  a cornercorner with one S(7)Tb3Si trigonal pyramid,  a cornercorner with one S(18)Tb4 trigonal pyramid,  a cornercorner with one S(19)Tb4 trigonal pyramid,  a cornercorner with one S(21)Tb4 trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid, and corners with two equivalent S(23)Tb4 trigonal pyramids. In the second S site, S(2) is bonded to one Tb(2), one Tb(4), one Tb(6), and one Si(2) atom to form distorted STb3Si tetrahedra that share  a cornercorner with one S(20)Tb3Si trigonal pyramid,  a cornercorner with one S(22)Tb3Si trigonal pyramid,  a cornercorner with one S(18)Tb4 trigonal pyramid,  a cornercorner with one S(19)Tb4 trigonal pyramid,  a cornercorner with one S(21)Tb4 trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid, and  an edgeedge with one S(7)Tb3Si trigonal pyramid. In the third S site, S(3) is bonded to one Tb(11), one Tb(7), one Tb(9), and one Si(4) atom to form distorted STb3Si tetrahedra that share  a cornercorner with one S(20)Tb3Si trigonal pyramid,  a cornercorner with one S(22)Tb3Si trigonal pyramid,  a cornercorner with one S(7)Tb3Si trigonal pyramid,  a cornercorner with one S(19)Tb4 trigonal pyramid,  a cornercorner with one S(21)Tb4 trigonal pyramid,  a cornercorner with one S(23)Tb4 trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid, and corners with two equivalent S(17)Tb3Si trigonal pyramids. In the fourth S site, S(4) is bonded to one Tb(10), one Tb(12), one Tb(8), and one Si(3) atom to form distorted STb3Si tetrahedra that share  a cornercorner with one S(20)Tb3Si trigonal pyramid,  a cornercorner with one S(22)Tb3Si trigonal pyramid,  a cornercorner with one S(19)Tb4 trigonal pyramid,  a cornercorner with one S(21)Tb4 trigonal pyramid,  a cornercorner with one S(23)Tb4 trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid, and corners with two equivalent S(18)Tb4 trigonal pyramids. In the fifth S site, S(5) is bonded in a distorted rectangular see-saw-like geometry to one Tb(11), one Tb(2), one Tb(6), and one Si(1) atom. In the sixth S site, S(6) is bonded in a 4-coordinate geometry to one Tb(1), one Tb(12), one Tb(5), and one Si(2) atom. In the seventh S site, S(7) is bonded to one Tb(2), one Tb(4), one Tb(7), and one Si(1) atom to form distorted STb3Si trigonal pyramids that share  a cornercorner with one S(1)Tb3Si tetrahedra,  a cornercorner with one S(3)Tb3Si tetrahedra,  a cornercorner with one S(20)Tb3Si trigonal pyramid,  a cornercorner with one S(18)Tb4 trigonal pyramid,  a cornercorner with one S(21)Tb4 trigonal pyramid,  a cornercorner with one S(23)Tb4 trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid,  an edgeedge with one S(2)Tb3Si tetrahedra, and  an edgeedge with one S(19)Tb4 trigonal pyramid. In the eighth S site, S(8) is bonded in a distorted rectangular see-saw-like geometry to one Tb(1), one Tb(3), one Tb(8), and one Si(2) atom. In the ninth S site, S(9) is bonded in a distorted rectangular see-saw-like geometry to one Tb(10), one Tb(4), one Tb(6), and one Si(1) atom. In the tenth S site, S(10) is bonded in a distorted rectangular see-saw-like geometry to one Tb(3), one Tb(5), one Tb(9), and one Si(2) atom. In the eleventh S site, S(11) is bonded in a distorted rectangular see-saw-like geometry to one Tb(11), one Tb(5), one Tb(7), and one Si(3) atom. In the twelfth S site, S(12) is bonded in a distorted rectangular see-saw-like geometry to one Tb(12), one Tb(6), one Tb(8), and one Si(4) atom. In the thirteenth S site, S(13) is bonded in a distorted rectangular see-saw-like geometry to one Tb(1), one Tb(7), one Tb(9), and one Si(3) atom. In the fourteenth S site, S(14) is bonded in a distorted rectangular see-saw-like geometry to one Tb(10), one Tb(2), one Tb(8), and one Si(4) atom. In the fifteenth S site, S(15) is bonded in a distorted rectangular see-saw-like geometry to one Tb(11), one Tb(4), one Tb(9), and one Si(3) atom. In the sixteenth S site, S(16) is bonded in a distorted rectangular see-saw-like geometry to one Tb(10), one Tb(12), one Tb(3), and one Si(4) atom. In the seventeenth S site, S(17) is bonded to one Tb(1), one Tb(11), one Tb(9), and one Si(5) atom to form distorted STb3Si trigonal pyramids that share  a cornercorner with one S(1)Tb3Si tetrahedra, corners with two equivalent S(3)Tb3Si tetrahedra,  a cornercorner with one S(18)Tb4 trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid,  an edgeedge with one S(20)Tb3Si trigonal pyramid, and  an edgeedge with one S(22)Tb3Si trigonal pyramid. In the eighteenth S site, S(18) is bonded to one Tb(1), one Tb(10), one Tb(12), and one Tb(2) atom to form distorted STb4 trigonal pyramids that share  a cornercorner with one S(1)Tb3Si tetrahedra,  a cornercorner with one S(2)Tb3Si tetrahedra, corners with two equivalent S(4)Tb3Si tetrahedra,  a cornercorner with one S(17)Tb3Si trigonal pyramid,  a cornercorner with one S(7)Tb3Si trigonal pyramid,  a cornercorner with one S(19)Tb4 trigonal pyramid,  a cornercorner with one S(21)Tb4 trigonal pyramid,  an edgeedge with one S(26)Tb4 trigonal pyramid, and  an edgeedge with one S(28)Tb4 trigonal pyramid. In the nineteenth S site, S(19) is bonded to one Tb(12), one Tb(3), one Tb(4), and one Tb(7) atom to form distorted STb4 trigonal pyramids that share  a cornercorner with one S(1)Tb3Si tetrahedra,  a cornercorner with one S(2)Tb3Si tetrahedra,  a cornercorner with one S(3)Tb3Si tetrahedra,  a cornercorner with one S(4)Tb3Si tetrahedra,  a cornercorner with one S(20)Tb3Si trigonal pyramid,  a cornercorner with one S(18)Tb4 trigonal pyramid,  a cornercorner with one S(21)Tb4 trigonal pyramid,  an edgeedge with one S(7)Tb3Si trigonal pyramid,  an edgeedge with one S(23)Tb4 trigonal pyramid, and  an edgeedge with one S(28)Tb4 trigonal pyramid. In the twentieth S site, S(20) is bonded to one Tb(11), one Tb(4), one Tb(8), and one Si(5) atom to form distorted STb3Si trigonal pyramids that share  a cornercorner with one S(2)Tb3Si tetrahedra,  a cornercorner with one S(3)Tb3Si tetrahedra,  a cornercorner with one S(4)Tb3Si tetrahedra,  a cornercorner with one S(7)Tb3Si trigonal pyramid,  a cornercorner with one S(19)Tb4 trigonal pyramid,  a cornercorner with one S(23)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid,  an edgeedge with one S(17)Tb3Si trigonal pyramid, and  an edgeedge with one S(22)Tb3Si trigonal pyramid. In the twenty-first S site, S(21) is bonded to one Tb(10), one Tb(5), one Tb(6), and one Tb(7) atom to form distorted STb4 trigonal pyramids that share  a cornercorner with one S(1)Tb3Si tetrahedra,  a cornercorner with one S(2)Tb3Si tetrahedra,  a cornercorner with one S(3)Tb3Si tetrahedra,  a cornercorner with one S(4)Tb3Si tetrahedra,  a cornercorner with one S(22)Tb3Si trigonal pyramid,  a cornercorner with one S(7)Tb3Si trigonal pyramid,  a cornercorner with one S(18)Tb4 trigonal pyramid,  a cornercorner with one S(19)Tb4 trigonal pyramid,  an edgeedge with one S(23)Tb4 trigonal pyramid, and  an edgeedge with one S(26)Tb4 trigonal pyramid. In the twenty-second S site, S(22) is bonded to one Tb(6), one Tb(8), one Tb(9), and one Si(5) atom to form distorted STb3Si trigonal pyramids that share  a cornercorner with one S(2)Tb3Si tetrahedra,  a cornercorner with one S(3)Tb3Si tetrahedra,  a cornercorner with one S(4)Tb3Si tetrahedra,  a cornercorner with one S(21)Tb4 trigonal pyramid,  a cornercorner with one S(23)Tb4 trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  an edgeedge with one S(17)Tb3Si trigonal pyramid, and  an edgeedge with one S(20)Tb3Si trigonal pyramid. In the twenty-third S site, S(23) is bonded to one Tb(3), one Tb(5), one Tb(7), and one Tb(8) atom to form distorted STb4 trigonal pyramids that share  a cornercorner with one S(3)Tb3Si tetrahedra,  a cornercorner with one S(4)Tb3Si tetrahedra, corners with two equivalent S(1)Tb3Si tetrahedra,  a cornercorner with one S(20)Tb3Si trigonal pyramid,  a cornercorner with one S(22)Tb3Si trigonal pyramid,  a cornercorner with one S(7)Tb3Si trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid,  an edgeedge with one S(19)Tb4 trigonal pyramid, and  an edgeedge with one S(21)Tb4 trigonal pyramid. In the twenty-fourth S site, S(24) is bonded in a 5-coordinate geometry to one Tb(4), one Tb(6), one Tb(7), one Tb(8), and one Si(5) atom. In the twenty-fifth S site, S(25) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(10), one Tb(6), one Tb(9), and one Si(5) atom. In the twenty-sixth S site, S(26) is bonded to one Tb(10), one Tb(2), one Tb(5), and one Tb(9) atom to form distorted STb4 trigonal pyramids that share  a cornercorner with one S(1)Tb3Si tetrahedra,  a cornercorner with one S(2)Tb3Si tetrahedra,  a cornercorner with one S(3)Tb3Si tetrahedra,  a cornercorner with one S(4)Tb3Si tetrahedra,  a cornercorner with one S(17)Tb3Si trigonal pyramid,  a cornercorner with one S(22)Tb3Si trigonal pyramid,  a cornercorner with one S(7)Tb3Si trigonal pyramid,  a cornercorner with one S(23)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid,  an edgeedge with one S(18)Tb4 trigonal pyramid, and  an edgeedge with one S(21)Tb4 trigonal pyramid. In the twenty-seventh S site, S(27) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(11), one Tb(12), one Tb(4), and one Si(5) atom. In the twenty-eighth S site, S(28) is bonded to one Tb(11), one Tb(12), one Tb(2), and one Tb(3) atom to form distorted STb4 trigonal pyramids that share  a cornercorner with one S(1)Tb3Si tetrahedra,  a cornercorner with one S(2)Tb3Si tetrahedra,  a cornercorner with one S(3)Tb3Si tetrahedra,  a cornercorner with one S(4)Tb3Si tetrahedra,  a cornercorner with one S(17)Tb3Si trigonal pyramid,  a cornercorner with one S(20)Tb3Si trigonal pyramid,  a cornercorner with one S(7)Tb3Si trigonal pyramid,  a cornercorner with one S(23)Tb4 trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  an edgeedge with one S(18)Tb4 trigonal pyramid, and  an edgeedge with one S(19)Tb4 trigonal pyramid.
Tb12Si5S28 crystallizes in the triclinic P1 space group. There are twelve inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 8-coordinate geometry to one S(1), one S(13), one S(17), one S(18), one S(25), one S(27), one S(6), and one S(8) atom. The Tb(1)-S(1) bond length is 2.91 Å. The Tb(1)-S(13) bond length is 3.02 Å. The Tb(1)-S(17) bond length is 2.83 Å. The Tb(1)-S(18) bond length is 2.97 Å. The Tb(1)-S(25) bond length is 2.79 Å. The Tb(1)-S(27) bond length is 2.77 Å. The Tb(1)-S(6) bond length is 2.89 Å. The Tb(1)-S(8) bond length is 2.78 Å. In the second Tb site, Tb(2) is bonded in a 7-coordinate geometry to one S(14), one S(18), one S(2), one S(26), one S(28), one S(5), and one S(7) atom. The Tb(2)-S(14) bond length is 3.01 Å. The Tb(2)-S(18) bond length is 2.73 Å. The Tb(2)-S(2) bond length is 2.97 Å. The Tb(2)-S(26) bond length is 2.69 Å. The Tb(2)-S(28) bond length is 2.73 Å. The Tb(2)-S(5) bond length is 2.88 Å. The Tb(2)-S(7) bond length is 2.88 Å. In the third Tb site, Tb(3) is bonded in a 7-coordinate geometry to one S(1), one S(10), one S(16), one S(19), one S(23), one S(28), and one S(8) atom. The Tb(3)-S(1) bond length is 2.95 Å. The Tb(3)-S(10) bond length is 2.93 Å. The Tb(3)-S(16) bond length is 2.98 Å. The Tb(3)-S(19) bond length is 2.73 Å. The Tb(3)-S(23) bond length is 2.75 Å. The Tb(3)-S(28) bond length is 2.69 Å. The Tb(3)-S(8) bond length is 2.89 Å. In the fourth Tb site, Tb(4) is bonded in a 8-coordinate geometry to one S(15), one S(19), one S(2), one S(20), one S(24), one S(27), one S(7), and one S(9) atom. The Tb(4)-S(15) bond length is 3.05 Å. The Tb(4)-S(19) bond length is 3.00 Å. The Tb(4)-S(2) bond length is 2.93 Å. The Tb(4)-S(20) bond length is 2.82 Å. The Tb(4)-S(24) bond length is 2.75 Å. The Tb(4)-S(27) bond length is 2.78 Å. The Tb(4)-S(7) bond length is 2.88 Å. The Tb(4)-S(9) bond length is 2.74 Å. In the fifth Tb site, Tb(5) is bonded in a 7-coordinate geometry to one S(1), one S(10), one S(11), one S(21), one S(23), one S(26), and one S(6) atom. The Tb(5)-S(1) bond length is 2.96 Å. The Tb(5)-S(10) bond length is 2.99 Å. The Tb(5)-S(11) bond length is 3.01 Å. The Tb(5)-S(21) bond length is 2.72 Å. The Tb(5)-S(23) bond length is 2.71 Å. The Tb(5)-S(26) bond length is 2.72 Å. The Tb(5)-S(6) bond length is 2.86 Å. In the sixth Tb site, Tb(6) is bonded in a 8-coordinate geometry to one S(12), one S(2), one S(21), one S(22), one S(24), one S(25), one S(5), and one S(9) atom. The Tb(6)-S(12) bond length is 3.00 Å. The Tb(6)-S(2) bond length is 2.93 Å. The Tb(6)-S(21) bond length is 3.01 Å. The Tb(6)-S(22) bond length is 2.83 Å. The Tb(6)-S(24) bond length is 2.76 Å. The Tb(6)-S(25) bond length is 2.79 Å. The Tb(6)-S(5) bond length is 2.79 Å. The Tb(6)-S(9) bond length is 2.81 Å. In the seventh Tb site, Tb(7) is bonded in a 8-coordinate geometry to one S(11), one S(13), one S(19), one S(21), one S(23), one S(24), one S(3), and one S(7) atom. The Tb(7)-S(11) bond length is 2.91 Å. The Tb(7)-S(13) bond length is 2.84 Å. The Tb(7)-S(19) bond length is 2.68 Å. The Tb(7)-S(21) bond length is 2.69 Å. The Tb(7)-S(23) bond length is 3.03 Å. The Tb(7)-S(24) bond length is 3.02 Å. The Tb(7)-S(3) bond length is 2.98 Å. The Tb(7)-S(7) bond length is 3.08 Å. In the eighth Tb site, Tb(8) is bonded in a 8-coordinate geometry to one S(12), one S(14), one S(20), one S(22), one S(23), one S(24), one S(4), and one S(8) atom. The Tb(8)-S(12) bond length is 2.85 Å. The Tb(8)-S(14) bond length is 2.78 Å. The Tb(8)-S(20) bond length is 2.79 Å. The Tb(8)-S(22) bond length is 2.83 Å. The Tb(8)-S(23) bond length is 2.77 Å. The Tb(8)-S(24) bond length is 3.26 Å. The Tb(8)-S(4) bond length is 2.93 Å. The Tb(8)-S(8) bond length is 2.94 Å. In the ninth Tb site, Tb(9) is bonded in a 8-coordinate geometry to one S(10), one S(13), one S(15), one S(17), one S(22), one S(25), one S(26), and one S(3) atom. The Tb(9)-S(10) bond length is 2.94 Å. The Tb(9)-S(13) bond length is 2.86 Å. The Tb(9)-S(15) bond length is 2.80 Å. The Tb(9)-S(17) bond length is 2.83 Å. The Tb(9)-S(22) bond length is 2.78 Å. The Tb(9)-S(25) bond length is 3.25 Å. The Tb(9)-S(26) bond length is 2.77 Å. The Tb(9)-S(3) bond length is 2.91 Å. In the tenth Tb site, Tb(10) is bonded in a 8-coordinate geometry to one S(14), one S(16), one S(18), one S(21), one S(25), one S(26), one S(4), and one S(9) atom. The Tb(10)-S(14) bond length is 2.90 Å. The Tb(10)-S(16) bond length is 2.82 Å. The Tb(10)-S(18) bond length is 2.71 Å. The Tb(10)-S(21) bond length is 2.69 Å. The Tb(10)-S(25) bond length is 3.00 Å. The Tb(10)-S(26) bond length is 3.05 Å. The Tb(10)-S(4) bond length is 3.02 Å. The Tb(10)-S(9) bond length is 3.05 Å. In the eleventh Tb site, Tb(11) is bonded in a 8-coordinate geometry to one S(11), one S(15), one S(17), one S(20), one S(27), one S(28), one S(3), and one S(5) atom. The Tb(11)-S(11) bond length is 2.79 Å. The Tb(11)-S(15) bond length is 2.87 Å. The Tb(11)-S(17) bond length is 2.78 Å. The Tb(11)-S(20) bond length is 2.82 Å. The Tb(11)-S(27) bond length is 3.24 Å. The Tb(11)-S(28) bond length is 2.78 Å. The Tb(11)-S(3) bond length is 2.90 Å. The Tb(11)-S(5) bond length is 2.90 Å. In the twelfth Tb site, Tb(12) is bonded in a 8-coordinate geometry to one S(12), one S(16), one S(18), one S(19), one S(27), one S(28), one S(4), and one S(6) atom. The Tb(12)-S(12) bond length is 2.83 Å. The Tb(12)-S(16) bond length is 2.89 Å. The Tb(12)-S(18) bond length is 2.69 Å. The Tb(12)-S(19) bond length is 2.70 Å. The Tb(12)-S(27) bond length is 3.00 Å. The Tb(12)-S(28) bond length is 3.05 Å. The Tb(12)-S(4) bond length is 3.03 Å. The Tb(12)-S(6) bond length is 3.12 Å. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one S(1), one S(5), one S(7), and one S(9) atom. The Si(1)-S(1) bond length is 2.11 Å. The Si(1)-S(5) bond length is 2.14 Å. The Si(1)-S(7) bond length is 2.14 Å. The Si(1)-S(9) bond length is 2.16 Å. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one S(10), one S(2), one S(6), and one S(8) atom. The Si(2)-S(10) bond length is 2.13 Å. The Si(2)-S(2) bond length is 2.12 Å. The Si(2)-S(6) bond length is 2.15 Å. The Si(2)-S(8) bond length is 2.15 Å. In the third Si site, Si(3) is bonded in a tetrahedral geometry to one S(11), one S(13), one S(15), and one S(4) atom. The Si(3)-S(11) bond length is 2.14 Å. The Si(3)-S(13) bond length is 2.14 Å. The Si(3)-S(15) bond length is 2.15 Å. The Si(3)-S(4) bond length is 2.12 Å. In the fourth Si site, Si(4) is bonded in a tetrahedral geometry to one S(12), one S(14), one S(16), and one S(3) atom. The Si(4)-S(12) bond length is 2.15 Å. The Si(4)-S(14) bond length is 2.14 Å. The Si(4)-S(16) bond length is 2.14 Å. The Si(4)-S(3) bond length is 2.13 Å. In the fifth Si site, Si(5) is bonded in an octahedral geometry to one S(17), one S(20), one S(22), one S(24), one S(25), and one S(27) atom. The Si(5)-S(17) bond length is 2.32 Å. The Si(5)-S(20) bond length is 2.33 Å. The Si(5)-S(22) bond length is 2.33 Å. The Si(5)-S(24) bond length is 2.40 Å. The Si(5)-S(25) bond length is 2.39 Å. The Si(5)-S(27) bond length is 2.40 Å. There are twenty-eight inequivalent S sites. In the first S site, S(1) is bonded to one Tb(1), one Tb(3), one Tb(5), and one Si(1) atom to form STb3Si tetrahedra that share  a cornercorner with one S(17)Tb3Si trigonal pyramid,  a cornercorner with one S(7)Tb3Si trigonal pyramid,  a cornercorner with one S(18)Tb4 trigonal pyramid,  a cornercorner with one S(19)Tb4 trigonal pyramid,  a cornercorner with one S(21)Tb4 trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid, and corners with two equivalent S(23)Tb4 trigonal pyramids. In the second S site, S(2) is bonded to one Tb(2), one Tb(4), one Tb(6), and one Si(2) atom to form distorted STb3Si tetrahedra that share  a cornercorner with one S(20)Tb3Si trigonal pyramid,  a cornercorner with one S(22)Tb3Si trigonal pyramid,  a cornercorner with one S(18)Tb4 trigonal pyramid,  a cornercorner with one S(19)Tb4 trigonal pyramid,  a cornercorner with one S(21)Tb4 trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid, and  an edgeedge with one S(7)Tb3Si trigonal pyramid. In the third S site, S(3) is bonded to one Tb(11), one Tb(7), one Tb(9), and one Si(4) atom to form distorted STb3Si tetrahedra that share  a cornercorner with one S(20)Tb3Si trigonal pyramid,  a cornercorner with one S(22)Tb3Si trigonal pyramid,  a cornercorner with one S(7)Tb3Si trigonal pyramid,  a cornercorner with one S(19)Tb4 trigonal pyramid,  a cornercorner with one S(21)Tb4 trigonal pyramid,  a cornercorner with one S(23)Tb4 trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid, and corners with two equivalent S(17)Tb3Si trigonal pyramids. In the fourth S site, S(4) is bonded to one Tb(10), one Tb(12), one Tb(8), and one Si(3) atom to form distorted STb3Si tetrahedra that share  a cornercorner with one S(20)Tb3Si trigonal pyramid,  a cornercorner with one S(22)Tb3Si trigonal pyramid,  a cornercorner with one S(19)Tb4 trigonal pyramid,  a cornercorner with one S(21)Tb4 trigonal pyramid,  a cornercorner with one S(23)Tb4 trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid, and corners with two equivalent S(18)Tb4 trigonal pyramids. In the fifth S site, S(5) is bonded in a distorted rectangular see-saw-like geometry to one Tb(11), one Tb(2), one Tb(6), and one Si(1) atom. In the sixth S site, S(6) is bonded in a 4-coordinate geometry to one Tb(1), one Tb(12), one Tb(5), and one Si(2) atom. In the seventh S site, S(7) is bonded to one Tb(2), one Tb(4), one Tb(7), and one Si(1) atom to form distorted STb3Si trigonal pyramids that share  a cornercorner with one S(1)Tb3Si tetrahedra,  a cornercorner with one S(3)Tb3Si tetrahedra,  a cornercorner with one S(20)Tb3Si trigonal pyramid,  a cornercorner with one S(18)Tb4 trigonal pyramid,  a cornercorner with one S(21)Tb4 trigonal pyramid,  a cornercorner with one S(23)Tb4 trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid,  an edgeedge with one S(2)Tb3Si tetrahedra, and  an edgeedge with one S(19)Tb4 trigonal pyramid. In the eighth S site, S(8) is bonded in a distorted rectangular see-saw-like geometry to one Tb(1), one Tb(3), one Tb(8), and one Si(2) atom. In the ninth S site, S(9) is bonded in a distorted rectangular see-saw-like geometry to one Tb(10), one Tb(4), one Tb(6), and one Si(1) atom. In the tenth S site, S(10) is bonded in a distorted rectangular see-saw-like geometry to one Tb(3), one Tb(5), one Tb(9), and one Si(2) atom. In the eleventh S site, S(11) is bonded in a distorted rectangular see-saw-like geometry to one Tb(11), one Tb(5), one Tb(7), and one Si(3) atom. In the twelfth S site, S(12) is bonded in a distorted rectangular see-saw-like geometry to one Tb(12), one Tb(6), one Tb(8), and one Si(4) atom. In the thirteenth S site, S(13) is bonded in a distorted rectangular see-saw-like geometry to one Tb(1), one Tb(7), one Tb(9), and one Si(3) atom. In the fourteenth S site, S(14) is bonded in a distorted rectangular see-saw-like geometry to one Tb(10), one Tb(2), one Tb(8), and one Si(4) atom. In the fifteenth S site, S(15) is bonded in a distorted rectangular see-saw-like geometry to one Tb(11), one Tb(4), one Tb(9), and one Si(3) atom. In the sixteenth S site, S(16) is bonded in a distorted rectangular see-saw-like geometry to one Tb(10), one Tb(12), one Tb(3), and one Si(4) atom. In the seventeenth S site, S(17) is bonded to one Tb(1), one Tb(11), one Tb(9), and one Si(5) atom to form distorted STb3Si trigonal pyramids that share  a cornercorner with one S(1)Tb3Si tetrahedra, corners with two equivalent S(3)Tb3Si tetrahedra,  a cornercorner with one S(18)Tb4 trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid,  an edgeedge with one S(20)Tb3Si trigonal pyramid, and  an edgeedge with one S(22)Tb3Si trigonal pyramid. In the eighteenth S site, S(18) is bonded to one Tb(1), one Tb(10), one Tb(12), and one Tb(2) atom to form distorted STb4 trigonal pyramids that share  a cornercorner with one S(1)Tb3Si tetrahedra,  a cornercorner with one S(2)Tb3Si tetrahedra, corners with two equivalent S(4)Tb3Si tetrahedra,  a cornercorner with one S(17)Tb3Si trigonal pyramid,  a cornercorner with one S(7)Tb3Si trigonal pyramid,  a cornercorner with one S(19)Tb4 trigonal pyramid,  a cornercorner with one S(21)Tb4 trigonal pyramid,  an edgeedge with one S(26)Tb4 trigonal pyramid, and  an edgeedge with one S(28)Tb4 trigonal pyramid. In the nineteenth S site, S(19) is bonded to one Tb(12), one Tb(3), one Tb(4), and one Tb(7) atom to form distorted STb4 trigonal pyramids that share  a cornercorner with one S(1)Tb3Si tetrahedra,  a cornercorner with one S(2)Tb3Si tetrahedra,  a cornercorner with one S(3)Tb3Si tetrahedra,  a cornercorner with one S(4)Tb3Si tetrahedra,  a cornercorner with one S(20)Tb3Si trigonal pyramid,  a cornercorner with one S(18)Tb4 trigonal pyramid,  a cornercorner with one S(21)Tb4 trigonal pyramid,  an edgeedge with one S(7)Tb3Si trigonal pyramid,  an edgeedge with one S(23)Tb4 trigonal pyramid, and  an edgeedge with one S(28)Tb4 trigonal pyramid. In the twentieth S site, S(20) is bonded to one Tb(11), one Tb(4), one Tb(8), and one Si(5) atom to form distorted STb3Si trigonal pyramids that share  a cornercorner with one S(2)Tb3Si tetrahedra,  a cornercorner with one S(3)Tb3Si tetrahedra,  a cornercorner with one S(4)Tb3Si tetrahedra,  a cornercorner with one S(7)Tb3Si trigonal pyramid,  a cornercorner with one S(19)Tb4 trigonal pyramid,  a cornercorner with one S(23)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid,  an edgeedge with one S(17)Tb3Si trigonal pyramid, and  an edgeedge with one S(22)Tb3Si trigonal pyramid. In the twenty-first S site, S(21) is bonded to one Tb(10), one Tb(5), one Tb(6), and one Tb(7) atom to form distorted STb4 trigonal pyramids that share  a cornercorner with one S(1)Tb3Si tetrahedra,  a cornercorner with one S(2)Tb3Si tetrahedra,  a cornercorner with one S(3)Tb3Si tetrahedra,  a cornercorner with one S(4)Tb3Si tetrahedra,  a cornercorner with one S(22)Tb3Si trigonal pyramid,  a cornercorner with one S(7)Tb3Si trigonal pyramid,  a cornercorner with one S(18)Tb4 trigonal pyramid,  a cornercorner with one S(19)Tb4 trigonal pyramid,  an edgeedge with one S(23)Tb4 trigonal pyramid, and  an edgeedge with one S(26)Tb4 trigonal pyramid. In the twenty-second S site, S(22) is bonded to one Tb(6), one Tb(8), one Tb(9), and one Si(5) atom to form distorted STb3Si trigonal pyramids that share  a cornercorner with one S(2)Tb3Si tetrahedra,  a cornercorner with one S(3)Tb3Si tetrahedra,  a cornercorner with one S(4)Tb3Si tetrahedra,  a cornercorner with one S(21)Tb4 trigonal pyramid,  a cornercorner with one S(23)Tb4 trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  an edgeedge with one S(17)Tb3Si trigonal pyramid, and  an edgeedge with one S(20)Tb3Si trigonal pyramid. In the twenty-third S site, S(23) is bonded to one Tb(3), one Tb(5), one Tb(7), and one Tb(8) atom to form distorted STb4 trigonal pyramids that share  a cornercorner with one S(3)Tb3Si tetrahedra,  a cornercorner with one S(4)Tb3Si tetrahedra, corners with two equivalent S(1)Tb3Si tetrahedra,  a cornercorner with one S(20)Tb3Si trigonal pyramid,  a cornercorner with one S(22)Tb3Si trigonal pyramid,  a cornercorner with one S(7)Tb3Si trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid,  an edgeedge with one S(19)Tb4 trigonal pyramid, and  an edgeedge with one S(21)Tb4 trigonal pyramid. In the twenty-fourth S site, S(24) is bonded in a 5-coordinate geometry to one Tb(4), one Tb(6), one Tb(7), one Tb(8), and one Si(5) atom. In the twenty-fifth S site, S(25) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(10), one Tb(6), one Tb(9), and one Si(5) atom. In the twenty-sixth S site, S(26) is bonded to one Tb(10), one Tb(2), one Tb(5), and one Tb(9) atom to form distorted STb4 trigonal pyramids that share  a cornercorner with one S(1)Tb3Si tetrahedra,  a cornercorner with one S(2)Tb3Si tetrahedra,  a cornercorner with one S(3)Tb3Si tetrahedra,  a cornercorner with one S(4)Tb3Si tetrahedra,  a cornercorner with one S(17)Tb3Si trigonal pyramid,  a cornercorner with one S(22)Tb3Si trigonal pyramid,  a cornercorner with one S(7)Tb3Si trigonal pyramid,  a cornercorner with one S(23)Tb4 trigonal pyramid,  a cornercorner with one S(28)Tb4 trigonal pyramid,  an edgeedge with one S(18)Tb4 trigonal pyramid, and  an edgeedge with one S(21)Tb4 trigonal pyramid. In the twenty-seventh S site, S(27) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(11), one Tb(12), one Tb(4), and one Si(5) atom. In the twenty-eighth S site, S(28) is bonded to one Tb(11), one Tb(12), one Tb(2), and one Tb(3) atom to form distorted STb4 trigonal pyramids that share  a cornercorner with one S(1)Tb3Si tetrahedra,  a cornercorner with one S(2)Tb3Si tetrahedra,  a cornercorner with one S(3)Tb3Si tetrahedra,  a cornercorner with one S(4)Tb3Si tetrahedra,  a cornercorner with one S(17)Tb3Si trigonal pyramid,  a cornercorner with one S(20)Tb3Si trigonal pyramid,  a cornercorner with one S(7)Tb3Si trigonal pyramid,  a cornercorner with one S(23)Tb4 trigonal pyramid,  a cornercorner with one S(26)Tb4 trigonal pyramid,  an edgeedge with one S(18)Tb4 trigonal pyramid, and  an edgeedge with one S(19)Tb4 trigonal pyramid.