Sm2Te3 is Stibnite structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent Te(1), two equivalent Te(3), and three equivalent Te(2) atoms to form a mixture of distorted corner and edge-sharing SmTe7 pentagonal bipyramids. In the second Sm site, Sm(2) is bonded in a 8-coordinate geometry to two equivalent Te(2), three equivalent Te(1), and three equivalent Te(3) atoms. There are three inequivalent Te sites. In the first Te site, Te(1) is bonded to two equivalent Sm(1) and three equivalent Sm(2) atoms to form a mixture of distorted corner and edge-sharing TeSm5 trigonal bipyramids. In the second Te site, Te(2) is bonded to two equivalent Sm(2) and three equivalent Sm(1) atoms to form a mixture of corner and edge-sharing TeSm5 square pyramids. In the third Te site, Te(3) is bonded in a 5-coordinate geometry to two equivalent Sm(1) and three equivalent Sm(2) atoms.
Sm2Te3 is Stibnite structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent Te(1), two equivalent Te(3), and three equivalent Te(2) atoms to form a mixture of distorted corner and edge-sharing SmTe7 pentagonal bipyramids. Both Sm(1)-Te(1) bond lengths are 3.16 Å. There is one shorter (3.16 Å) and one longer (3.26 Å) Sm(1)-Te(3) bond length. There are two shorter (3.16 Å) and one longer (3.18 Å) Sm(1)-Te(2) bond length. In the second Sm site, Sm(2) is bonded in a 8-coordinate geometry to two equivalent Te(2), three equivalent Te(1), and three equivalent Te(3) atoms. Both Sm(2)-Te(2) bond lengths are 3.22 Å. There are two shorter (3.23 Å) and one longer (3.28 Å) Sm(2)-Te(1) bond length. There are two shorter (3.24 Å) and one longer (3.76 Å) Sm(2)-Te(3) bond length. There are three inequivalent Te sites. In the first Te site, Te(1) is bonded to two equivalent Sm(1) and three equivalent Sm(2) atoms to form a mixture of distorted corner and edge-sharing TeSm5 trigonal bipyramids. In the second Te site, Te(2) is bonded to two equivalent Sm(2) and three equivalent Sm(1) atoms to form a mixture of corner and edge-sharing TeSm5 square pyramids. In the third Te site, Te(3) is bonded in a 5-coordinate geometry to two equivalent Sm(1) and three equivalent Sm(2) atoms.