PmBi3 crystallizes in the hexagonal P6_3/mmc space group. Pm(1) is bonded to twelve equivalent Bi(1) atoms to form a mixture of corner and face-sharing PmBi12 cuboctahedra. Bi(1) is bonded in a 4-coordinate geometry to four equivalent Pm(1) atoms.
PmBi3 crystallizes in the hexagonal P6_3/mmc space group. Pm(1) is bonded to twelve equivalent Bi(1) atoms to form a mixture of corner and face-sharing PmBi12 cuboctahedra. There are six shorter (3.45 Å) and six longer (3.55 Å) Pm(1)-Bi(1) bond lengths. Bi(1) is bonded in a 4-coordinate geometry to four equivalent Pm(1) atoms.