PmBi3 crystallizes in the tetragonal I4/mmm space group. Pm(1) is bonded to four equivalent Bi(2) and eight equivalent Bi(1) atoms to form a mixture of edge, face, and corner-sharing PmBi12 cuboctahedra. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 8-coordinate geometry to four equivalent Pm(1) and four equivalent Bi(1) atoms. In the second Bi site, Bi(2) is bonded in a square co-planar geometry to four equivalent Pm(1) atoms.
PmBi3 crystallizes in the tetragonal I4/mmm space group. Pm(1) is bonded to four equivalent Bi(2) and eight equivalent Bi(1) atoms to form a mixture of edge, face, and corner-sharing PmBi12 cuboctahedra. All Pm(1)-Bi(2) bond lengths are 3.30 Å. All Pm(1)-Bi(1) bond lengths are 3.67 Å. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 8-coordinate geometry to four equivalent Pm(1) and four equivalent Bi(1) atoms. All Bi(1)-Bi(1) bond lengths are 3.30 Å. In the second Bi site, Bi(2) is bonded in a square co-planar geometry to four equivalent Pm(1) atoms.