Sm5Tl3 crystallizes in the tetragonal I4/mcm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 6-coordinate geometry to two equivalent Tl(2) and four equivalent Tl(1) atoms. In the second Sm site, Sm(2) is bonded in a 6-coordinate geometry to two equivalent Sm(2) and four equivalent Tl(1) atoms. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a 10-coordinate geometry to two equivalent Sm(2) and eight equivalent Sm(1) atoms. In the second Tl site, Tl(2) is bonded in a 10-coordinate geometry to eight equivalent Sm(1) and two equivalent Tl(2) atoms.
Sm5Tl3 crystallizes in the tetragonal I4/mcm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 6-coordinate geometry to two equivalent Tl(2) and four equivalent Tl(1) atoms. Both Sm(1)-Tl(2) bond lengths are 3.31 Å. There are a spread of Sm(1)-Tl(1) bond distances ranging from 3.25-3.62 Å. In the second Sm site, Sm(2) is bonded in a 6-coordinate geometry to two equivalent Sm(2) and four equivalent Tl(1) atoms. Both Sm(2)-Sm(2) bond lengths are 3.15 Å. All Sm(2)-Tl(1) bond lengths are 3.24 Å. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a 10-coordinate geometry to two equivalent Sm(2) and eight equivalent Sm(1) atoms. In the second Tl site, Tl(2) is bonded in a 10-coordinate geometry to eight equivalent Sm(1) and two equivalent Tl(2) atoms. Both Tl(2)-Tl(2) bond lengths are 3.15 Å.