Th5Tl3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Th sites. In the first Th site, Th(1) is bonded in a 8-coordinate geometry to two equivalent Th(1) and six equivalent Tl(1) atoms. In the second Th site, Th(2) is bonded in a 5-coordinate geometry to five equivalent Tl(1) atoms. Tl(1) is bonded in a 9-coordinate geometry to four equivalent Th(1) and five equivalent Th(2) atoms.
Th5Tl3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Th sites. In the first Th site, Th(1) is bonded in a 8-coordinate geometry to two equivalent Th(1) and six equivalent Tl(1) atoms. Both Th(1)-Th(1) bond lengths are 3.19 Å. All Th(1)-Tl(1) bond lengths are 3.36 Å. In the second Th site, Th(2) is bonded in a 5-coordinate geometry to five equivalent Tl(1) atoms. There are a spread of Th(2)-Tl(1) bond distances ranging from 3.26-3.51 Å. Tl(1) is bonded in a 9-coordinate geometry to four equivalent Th(1) and five equivalent Th(2) atoms.