Th5Pb4 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 6-coordinate geometry to six equivalent Pb(2) atoms. In the second Th site, Th(2) is bonded to two equivalent Pb(1) and five equivalent Pb(2) atoms to form a mixture of distorted corner, edge, and face-sharing ThPb7 pentagonal bipyramids. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to six equivalent Th(2) atoms to form distorted face-sharing PbTh6 octahedra. In the second Pb site, Pb(2) is bonded in a 9-coordinate geometry to four equivalent Th(1) and five equivalent Th(2) atoms.
Th5Pb4 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 6-coordinate geometry to six equivalent Pb(2) atoms. All Th(1)-Pb(2) bond lengths are 3.49 Å. In the second Th site, Th(2) is bonded to two equivalent Pb(1) and five equivalent Pb(2) atoms to form a mixture of distorted corner, edge, and face-sharing ThPb7 pentagonal bipyramids. Both Th(2)-Pb(1) bond lengths are 3.22 Å. There are a spread of Th(2)-Pb(2) bond distances ranging from 3.33-3.45 Å. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to six equivalent Th(2) atoms to form distorted face-sharing PbTh6 octahedra. In the second Pb site, Pb(2) is bonded in a 9-coordinate geometry to four equivalent Th(1) and five equivalent Th(2) atoms.