La5CuBi3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 6-coordinate geometry to six equivalent Bi(1) atoms. In the second La site, La(2) is bonded to two equivalent Cu(1) and five equivalent Bi(1) atoms to form a mixture of distorted edge, corner, and face-sharing LaCu2Bi5 pentagonal bipyramids. Cu(1) is bonded to six equivalent La(2) atoms to form face-sharing CuLa6 octahedra. Bi(1) is bonded in a 9-coordinate geometry to four equivalent La(1) and five equivalent La(2) atoms.
La5CuBi3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 6-coordinate geometry to six equivalent Bi(1) atoms. All La(1)-Bi(1) bond lengths are 3.49 Å. In the second La site, La(2) is bonded to two equivalent Cu(1) and five equivalent Bi(1) atoms to form a mixture of distorted edge, corner, and face-sharing LaCu2Bi5 pentagonal bipyramids. Both La(2)-Cu(1) bond lengths are 3.05 Å. There are a spread of La(2)-Bi(1) bond distances ranging from 3.34-3.58 Å. Cu(1) is bonded to six equivalent La(2) atoms to form face-sharing CuLa6 octahedra. Bi(1) is bonded in a 9-coordinate geometry to four equivalent La(1) and five equivalent La(2) atoms.