Yb3(Bi7Te12)2 crystallizes in the triclinic P1 space group. There are three inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 8-coordinate geometry to one Te(1), one Te(18), one Te(19), one Te(2), one Te(23), one Te(24), one Te(4), and one Te(8) atom. In the second Yb site, Yb(2) is bonded in a 8-coordinate geometry to one Te(1), one Te(10), one Te(16), one Te(2), one Te(4), one Te(5), one Te(7), and one Te(8) atom. In the third Yb site, Yb(3) is bonded in a 8-coordinate geometry to one Te(12), one Te(18), one Te(19), one Te(20), one Te(23), one Te(24), one Te(4), and one Te(9) atom. There are fourteen inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one Te(14), one Te(15), one Te(16), one Te(3), one Te(5), and one Te(6) atom to form a mixture of distorted corner and edge-sharing BiTe6 pentagonal pyramids. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one Te(1), one Te(10), one Te(19), one Te(2), one Te(4), and one Te(8) atom. In the third Bi site, Bi(3) is bonded in a 6-coordinate geometry to one Te(11), one Te(12), one Te(13), one Te(20), one Te(21), and one Te(22) atom. In the fourth Bi site, Bi(4) is bonded to one Te(14), one Te(15), one Te(16), one Te(17), one Te(3), and one Te(7) atom to form a mixture of corner and edge-sharing BiTe6 pentagonal pyramids. In the fifth Bi site, Bi(5) is bonded in a 6-coordinate geometry to one Te(1), one Te(10), one Te(15), one Te(2), one Te(5), and one Te(7) atom. In the sixth Bi site, Bi(6) is bonded to one Te(10), one Te(15), one Te(2), one Te(5), one Te(7), and one Te(8) atom to form a mixture of corner and edge-sharing BiTe6 pentagonal pyramids. In the seventh Bi site, Bi(7) is bonded to one Te(1), one Te(10), one Te(18), one Te(24), one Te(4), and one Te(8) atom to form a mixture of distorted corner and edge-sharing BiTe6 pentagonal pyramids. In the eighth Bi site, Bi(8) is bonded to one Te(12), one Te(18), one Te(19), one Te(20), one Te(23), and one Te(24) atom to form a mixture of distorted corner and edge-sharing BiTe6 pentagonal pyramids. In the ninth Bi site, Bi(9) is bonded to one Te(13), one Te(20), one Te(21), one Te(22), one Te(23), and one Te(9) atom to form a mixture of distorted corner, edge, and face-sharing BiTe6 pentagonal pyramids. In the tenth Bi site, Bi(10) is bonded to one Te(11), one Te(13), one Te(20), one Te(21), one Te(22), and one Te(3) atom to form a mixture of distorted corner and face-sharing BiTe6 pentagonal pyramids. In the eleventh Bi site, Bi(11) is bonded in a 6-coordinate geometry to one Te(11), one Te(13), one Te(14), one Te(17), one Te(21), and one Te(6) atom. In the twelfth Bi site, Bi(12) is bonded in a 5-coordinate geometry to one Te(16), one Te(17), one Te(3), one Te(5), and one Te(6) atom. In the thirteenth Bi site, Bi(13) is bonded in a 5-coordinate geometry to one Te(12), one Te(18), one Te(19), one Te(4), and one Te(9) atom. In the fourteenth Bi site, Bi(14) is bonded to one Te(11), one Te(12), one Te(13), one Te(22), one Te(23), and one Te(9) atom to form a mixture of distorted corner and edge-sharing BiTe6 pentagonal pyramids. There are twenty-four inequivalent Te sites. In the first Te site, Te(1) is bonded to one Yb(1), one Yb(2), one Bi(2), one Bi(5), and one Bi(7) atom to form TeYb2Bi3 square pyramids that share corners with two equivalent Te(5)YbBi4 trigonal bipyramids,  a cornercorner with one Te(15)Bi4 trigonal pyramid, and  an edgeedge with one Te(18)Yb2Bi3 trigonal bipyramid. In the second Te site, Te(2) is bonded in a distorted L-shaped geometry to one Yb(1), one Yb(2), one Bi(2), one Bi(5), and one Bi(6) atom. In the third Te site, Te(3) is bonded to one Bi(1), one Bi(10), one Bi(12), and one Bi(4) atom to form distorted TeBi4 trigonal pyramids that share  a cornercorner with one Te(11)Bi4 trigonal pyramid,  an edgeedge with one Te(5)YbBi4 trigonal bipyramid, and  an edgeedge with one Te(15)Bi4 trigonal pyramid. In the fourth Te site, Te(4) is bonded in a 6-coordinate geometry to one Yb(1), one Yb(2), one Yb(3), one Bi(13), one Bi(2), and one Bi(7) atom. In the fifth Te site, Te(5) is bonded to one Yb(2), one Bi(1), one Bi(12), one Bi(5), and one Bi(6) atom to form distorted TeYbBi4 trigonal bipyramids that share corners with two equivalent Te(1)Yb2Bi3 square pyramids,  a cornercorner with one Te(15)Bi4 trigonal pyramid,  an edgeedge with one Te(15)Bi4 trigonal pyramid, and  an edgeedge with one Te(3)Bi4 trigonal pyramid. In the sixth Te site, Te(6) is bonded in a distorted T-shaped geometry to one Bi(1), one Bi(11), and one Bi(12) atom. In the seventh Te site, Te(7) is bonded in a distorted see-saw-like geometry to one Yb(2), one Bi(4), one Bi(5), and one Bi(6) atom. In the eighth Te site, Te(8) is bonded in a 5-coordinate geometry to one Yb(1), one Yb(2), one Bi(2), one Bi(6), and one Bi(7) atom. In the ninth Te site, Te(9) is bonded in a 4-coordinate geometry to one Yb(3), one Bi(13), one Bi(14), and one Bi(9) atom. In the tenth Te site, Te(10) is bonded in a 5-coordinate geometry to one Yb(2), one Bi(2), one Bi(5), one Bi(6), and one Bi(7) atom. In the eleventh Te site, Te(11) is bonded to one Bi(10), one Bi(11), one Bi(14), and one Bi(3) atom to form distorted corner-sharing TeBi4 trigonal pyramids. In the twelfth Te site, Te(12) is bonded in a 5-coordinate geometry to one Yb(3), one Bi(13), one Bi(14), one Bi(3), and one Bi(8) atom. In the thirteenth Te site, Te(13) is bonded in a 5-coordinate geometry to one Bi(10), one Bi(11), one Bi(14), one Bi(3), and one Bi(9) atom. In the fourteenth Te site, Te(14) is bonded in a distorted T-shaped geometry to one Bi(1), one Bi(11), and one Bi(4) atom. In the fifteenth Te site, Te(15) is bonded to one Bi(1), one Bi(4), one Bi(5), and one Bi(6) atom to form TeBi4 trigonal pyramids that share  a cornercorner with one Te(1)Yb2Bi3 square pyramid,  a cornercorner with one Te(5)YbBi4 trigonal bipyramid,  an edgeedge with one Te(5)YbBi4 trigonal bipyramid, and  an edgeedge with one Te(3)Bi4 trigonal pyramid. In the sixteenth Te site, Te(16) is bonded in a 4-coordinate geometry to one Yb(2), one Bi(1), one Bi(12), and one Bi(4) atom. In the seventeenth Te site, Te(17) is bonded in a distorted T-shaped geometry to one Bi(11), one Bi(12), and one Bi(4) atom. In the eighteenth Te site, Te(18) is bonded to one Yb(1), one Yb(3), one Bi(13), one Bi(7), and one Bi(8) atom to form distorted edge-sharing TeYb2Bi3 trigonal bipyramids. In the nineteenth Te site, Te(19) is bonded in a 5-coordinate geometry to one Yb(1), one Yb(3), one Bi(13), one Bi(2), and one Bi(8) atom. In the twentieth Te site, Te(20) is bonded in a 5-coordinate geometry to one Yb(3), one Bi(10), one Bi(3), one Bi(8), and one Bi(9) atom. In the twenty-first Te site, Te(21) is bonded in a rectangular see-saw-like geometry to one Bi(10), one Bi(11), one Bi(3), and one Bi(9) atom. In the twenty-second Te site, Te(22) is bonded in a distorted see-saw-like geometry to one Bi(10), one Bi(14), one Bi(3), and one Bi(9) atom. In the twenty-third Te site, Te(23) is bonded in a 5-coordinate geometry to one Yb(1), one Yb(3), one Bi(14), one Bi(8), and one Bi(9) atom. In the twenty-fourth Te site, Te(24) is bonded in a 4-coordinate geometry to one Yb(1), one Yb(3), one Bi(7), and one Bi(8) atom.
Yb3(Bi7Te12)2 crystallizes in the triclinic P1 space group. There are three inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 8-coordinate geometry to one Te(1), one Te(18), one Te(19), one Te(2), one Te(23), one Te(24), one Te(4), and one Te(8) atom. The Yb(1)-Te(1) bond length is 3.55 Å. The Yb(1)-Te(18) bond length is 3.23 Å. The Yb(1)-Te(19) bond length is 3.34 Å. The Yb(1)-Te(2) bond length is 3.20 Å. The Yb(1)-Te(23) bond length is 3.74 Å. The Yb(1)-Te(24) bond length is 3.14 Å. The Yb(1)-Te(4) bond length is 3.24 Å. The Yb(1)-Te(8) bond length is 3.35 Å. In the second Yb site, Yb(2) is bonded in a 8-coordinate geometry to one Te(1), one Te(10), one Te(16), one Te(2), one Te(4), one Te(5), one Te(7), and one Te(8) atom. The Yb(2)-Te(1) bond length is 3.56 Å. The Yb(2)-Te(10) bond length is 3.19 Å. The Yb(2)-Te(16) bond length is 3.24 Å. The Yb(2)-Te(2) bond length is 3.14 Å. The Yb(2)-Te(4) bond length is 3.39 Å. The Yb(2)-Te(5) bond length is 3.43 Å. The Yb(2)-Te(7) bond length is 3.64 Å. The Yb(2)-Te(8) bond length is 3.17 Å. In the third Yb site, Yb(3) is bonded in a 8-coordinate geometry to one Te(12), one Te(18), one Te(19), one Te(20), one Te(23), one Te(24), one Te(4), and one Te(9) atom. The Yb(3)-Te(12) bond length is 3.14 Å. The Yb(3)-Te(18) bond length is 3.50 Å. The Yb(3)-Te(19) bond length is 3.17 Å. The Yb(3)-Te(20) bond length is 3.24 Å. The Yb(3)-Te(23) bond length is 3.73 Å. The Yb(3)-Te(24) bond length is 3.37 Å. The Yb(3)-Te(4) bond length is 3.20 Å. The Yb(3)-Te(9) bond length is 3.54 Å. There are fourteen inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one Te(14), one Te(15), one Te(16), one Te(3), one Te(5), and one Te(6) atom to form a mixture of distorted corner and edge-sharing BiTe6 pentagonal pyramids. The Bi(1)-Te(14) bond length is 3.02 Å. The Bi(1)-Te(15) bond length is 3.43 Å. The Bi(1)-Te(16) bond length is 3.03 Å. The Bi(1)-Te(3) bond length is 3.47 Å. The Bi(1)-Te(5) bond length is 3.17 Å. The Bi(1)-Te(6) bond length is 3.14 Å. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one Te(1), one Te(10), one Te(19), one Te(2), one Te(4), and one Te(8) atom. The Bi(2)-Te(1) bond length is 3.00 Å. The Bi(2)-Te(10) bond length is 3.35 Å. The Bi(2)-Te(19) bond length is 3.12 Å. The Bi(2)-Te(2) bond length is 3.38 Å. The Bi(2)-Te(4) bond length is 3.30 Å. The Bi(2)-Te(8) bond length is 3.44 Å. In the third Bi site, Bi(3) is bonded in a 6-coordinate geometry to one Te(11), one Te(12), one Te(13), one Te(20), one Te(21), and one Te(22) atom. The Bi(3)-Te(11) bond length is 3.13 Å. The Bi(3)-Te(12) bond length is 3.23 Å. The Bi(3)-Te(13) bond length is 3.48 Å. The Bi(3)-Te(20) bond length is 3.31 Å. The Bi(3)-Te(21) bond length is 3.14 Å. The Bi(3)-Te(22) bond length is 3.23 Å. In the fourth Bi site, Bi(4) is bonded to one Te(14), one Te(15), one Te(16), one Te(17), one Te(3), and one Te(7) atom to form a mixture of corner and edge-sharing BiTe6 pentagonal pyramids. The Bi(4)-Te(14) bond length is 3.29 Å. The Bi(4)-Te(15) bond length is 3.15 Å. The Bi(4)-Te(16) bond length is 3.17 Å. The Bi(4)-Te(17) bond length is 3.18 Å. The Bi(4)-Te(3) bond length is 3.23 Å. The Bi(4)-Te(7) bond length is 3.12 Å. In the fifth Bi site, Bi(5) is bonded in a 6-coordinate geometry to one Te(1), one Te(10), one Te(15), one Te(2), one Te(5), and one Te(7) atom. The Bi(5)-Te(1) bond length is 3.08 Å. The Bi(5)-Te(10) bond length is 3.43 Å. The Bi(5)-Te(15) bond length is 3.23 Å. The Bi(5)-Te(2) bond length is 3.27 Å. The Bi(5)-Te(5) bond length is 3.28 Å. The Bi(5)-Te(7) bond length is 3.13 Å. In the sixth Bi site, Bi(6) is bonded to one Te(10), one Te(15), one Te(2), one Te(5), one Te(7), and one Te(8) atom to form a mixture of corner and edge-sharing BiTe6 pentagonal pyramids. The Bi(6)-Te(10) bond length is 3.15 Å. The Bi(6)-Te(15) bond length is 3.06 Å. The Bi(6)-Te(2) bond length is 3.35 Å. The Bi(6)-Te(5) bond length is 3.12 Å. The Bi(6)-Te(7) bond length is 3.16 Å. The Bi(6)-Te(8) bond length is 3.26 Å. In the seventh Bi site, Bi(7) is bonded to one Te(1), one Te(10), one Te(18), one Te(24), one Te(4), and one Te(8) atom to form a mixture of distorted corner and edge-sharing BiTe6 pentagonal pyramids. The Bi(7)-Te(1) bond length is 3.21 Å. The Bi(7)-Te(10) bond length is 3.14 Å. The Bi(7)-Te(18) bond length is 3.14 Å. The Bi(7)-Te(24) bond length is 3.30 Å. The Bi(7)-Te(4) bond length is 3.27 Å. The Bi(7)-Te(8) bond length is 3.20 Å. In the eighth Bi site, Bi(8) is bonded to one Te(12), one Te(18), one Te(19), one Te(20), one Te(23), and one Te(24) atom to form a mixture of distorted corner and edge-sharing BiTe6 pentagonal pyramids. The Bi(8)-Te(12) bond length is 3.20 Å. The Bi(8)-Te(18) bond length is 3.26 Å. The Bi(8)-Te(19) bond length is 3.35 Å. The Bi(8)-Te(20) bond length is 3.24 Å. The Bi(8)-Te(23) bond length is 3.18 Å. The Bi(8)-Te(24) bond length is 3.04 Å. In the ninth Bi site, Bi(9) is bonded to one Te(13), one Te(20), one Te(21), one Te(22), one Te(23), and one Te(9) atom to form a mixture of distorted corner, edge, and face-sharing BiTe6 pentagonal pyramids. The Bi(9)-Te(13) bond length is 3.17 Å. The Bi(9)-Te(20) bond length is 3.06 Å. The Bi(9)-Te(21) bond length is 3.45 Å. The Bi(9)-Te(22) bond length is 3.04 Å. The Bi(9)-Te(23) bond length is 3.17 Å. The Bi(9)-Te(9) bond length is 3.45 Å. In the tenth Bi site, Bi(10) is bonded to one Te(11), one Te(13), one Te(20), one Te(21), one Te(22), and one Te(3) atom to form a mixture of distorted corner and face-sharing BiTe6 pentagonal pyramids. The Bi(10)-Te(11) bond length is 3.04 Å. The Bi(10)-Te(13) bond length is 3.28 Å. The Bi(10)-Te(20) bond length is 3.48 Å. The Bi(10)-Te(21) bond length is 3.20 Å. The Bi(10)-Te(22) bond length is 3.23 Å. The Bi(10)-Te(3) bond length is 3.15 Å. In the eleventh Bi site, Bi(11) is bonded in a 6-coordinate geometry to one Te(11), one Te(13), one Te(14), one Te(17), one Te(21), and one Te(6) atom. The Bi(11)-Te(11) bond length is 3.52 Å. The Bi(11)-Te(13) bond length is 3.57 Å. The Bi(11)-Te(14) bond length is 3.16 Å. The Bi(11)-Te(17) bond length is 3.02 Å. The Bi(11)-Te(21) bond length is 3.15 Å. The Bi(11)-Te(6) bond length is 3.05 Å. In the twelfth Bi site, Bi(12) is bonded in a 5-coordinate geometry to one Te(16), one Te(17), one Te(3), one Te(5), and one Te(6) atom. The Bi(12)-Te(16) bond length is 3.31 Å. The Bi(12)-Te(17) bond length is 3.08 Å. The Bi(12)-Te(3) bond length is 3.02 Å. The Bi(12)-Te(5) bond length is 3.40 Å. The Bi(12)-Te(6) bond length is 3.05 Å. In the thirteenth Bi site, Bi(13) is bonded in a 5-coordinate geometry to one Te(12), one Te(18), one Te(19), one Te(4), and one Te(9) atom. The Bi(13)-Te(12) bond length is 3.25 Å. The Bi(13)-Te(18) bond length is 3.17 Å. The Bi(13)-Te(19) bond length is 3.17 Å. The Bi(13)-Te(4) bond length is 3.38 Å. The Bi(13)-Te(9) bond length is 3.06 Å. In the fourteenth Bi site, Bi(14) is bonded to one Te(11), one Te(12), one Te(13), one Te(22), one Te(23), and one Te(9) atom to form a mixture of distorted corner and edge-sharing BiTe6 pentagonal pyramids. The Bi(14)-Te(11) bond length is 3.11 Å. The Bi(14)-Te(12) bond length is 3.38 Å. The Bi(14)-Te(13) bond length is 3.11 Å. The Bi(14)-Te(22) bond length is 3.35 Å. The Bi(14)-Te(23) bond length is 3.29 Å. The Bi(14)-Te(9) bond length is 3.05 Å. There are twenty-four inequivalent Te sites. In the first Te site, Te(1) is bonded to one Yb(1), one Yb(2), one Bi(2), one Bi(5), and one Bi(7) atom to form TeYb2Bi3 square pyramids that share corners with two equivalent Te(5)YbBi4 trigonal bipyramids,  a cornercorner with one Te(15)Bi4 trigonal pyramid, and  an edgeedge with one Te(18)Yb2Bi3 trigonal bipyramid. In the second Te site, Te(2) is bonded in a distorted L-shaped geometry to one Yb(1), one Yb(2), one Bi(2), one Bi(5), and one Bi(6) atom. In the third Te site, Te(3) is bonded to one Bi(1), one Bi(10), one Bi(12), and one Bi(4) atom to form distorted TeBi4 trigonal pyramids that share  a cornercorner with one Te(11)Bi4 trigonal pyramid,  an edgeedge with one Te(5)YbBi4 trigonal bipyramid, and  an edgeedge with one Te(15)Bi4 trigonal pyramid. In the fourth Te site, Te(4) is bonded in a 6-coordinate geometry to one Yb(1), one Yb(2), one Yb(3), one Bi(13), one Bi(2), and one Bi(7) atom. In the fifth Te site, Te(5) is bonded to one Yb(2), one Bi(1), one Bi(12), one Bi(5), and one Bi(6) atom to form distorted TeYbBi4 trigonal bipyramids that share corners with two equivalent Te(1)Yb2Bi3 square pyramids,  a cornercorner with one Te(15)Bi4 trigonal pyramid,  an edgeedge with one Te(15)Bi4 trigonal pyramid, and  an edgeedge with one Te(3)Bi4 trigonal pyramid. In the sixth Te site, Te(6) is bonded in a distorted T-shaped geometry to one Bi(1), one Bi(11), and one Bi(12) atom. In the seventh Te site, Te(7) is bonded in a distorted see-saw-like geometry to one Yb(2), one Bi(4), one Bi(5), and one Bi(6) atom. In the eighth Te site, Te(8) is bonded in a 5-coordinate geometry to one Yb(1), one Yb(2), one Bi(2), one Bi(6), and one Bi(7) atom. In the ninth Te site, Te(9) is bonded in a 4-coordinate geometry to one Yb(3), one Bi(13), one Bi(14), and one Bi(9) atom. In the tenth Te site, Te(10) is bonded in a 5-coordinate geometry to one Yb(2), one Bi(2), one Bi(5), one Bi(6), and one Bi(7) atom. In the eleventh Te site, Te(11) is bonded to one Bi(10), one Bi(11), one Bi(14), and one Bi(3) atom to form distorted corner-sharing TeBi4 trigonal pyramids. In the twelfth Te site, Te(12) is bonded in a 5-coordinate geometry to one Yb(3), one Bi(13), one Bi(14), one Bi(3), and one Bi(8) atom. In the thirteenth Te site, Te(13) is bonded in a 5-coordinate geometry to one Bi(10), one Bi(11), one Bi(14), one Bi(3), and one Bi(9) atom. In the fourteenth Te site, Te(14) is bonded in a distorted T-shaped geometry to one Bi(1), one Bi(11), and one Bi(4) atom. In the fifteenth Te site, Te(15) is bonded to one Bi(1), one Bi(4), one Bi(5), and one Bi(6) atom to form TeBi4 trigonal pyramids that share  a cornercorner with one Te(1)Yb2Bi3 square pyramid,  a cornercorner with one Te(5)YbBi4 trigonal bipyramid,  an edgeedge with one Te(5)YbBi4 trigonal bipyramid, and  an edgeedge with one Te(3)Bi4 trigonal pyramid. In the sixteenth Te site, Te(16) is bonded in a 4-coordinate geometry to one Yb(2), one Bi(1), one Bi(12), and one Bi(4) atom. In the seventeenth Te site, Te(17) is bonded in a distorted T-shaped geometry to one Bi(11), one Bi(12), and one Bi(4) atom. In the eighteenth Te site, Te(18) is bonded to one Yb(1), one Yb(3), one Bi(13), one Bi(7), and one Bi(8) atom to form distorted edge-sharing TeYb2Bi3 trigonal bipyramids. In the nineteenth Te site, Te(19) is bonded in a 5-coordinate geometry to one Yb(1), one Yb(3), one Bi(13), one Bi(2), and one Bi(8) atom. In the twentieth Te site, Te(20) is bonded in a 5-coordinate geometry to one Yb(3), one Bi(10), one Bi(3), one Bi(8), and one Bi(9) atom. In the twenty-first Te site, Te(21) is bonded in a rectangular see-saw-like geometry to one Bi(10), one Bi(11), one Bi(3), and one Bi(9) atom. In the twenty-second Te site, Te(22) is bonded in a distorted see-saw-like geometry to one Bi(10), one Bi(14), one Bi(3), and one Bi(9) atom. In the twenty-third Te site, Te(23) is bonded in a 5-coordinate geometry to one Yb(1), one Yb(3), one Bi(14), one Bi(8), and one Bi(9) atom. In the twenty-fourth Te site, Te(24) is bonded in a 4-coordinate geometry to one Yb(1), one Yb(3), one Bi(7), and one Bi(8) atom.