PmNi3 crystallizes in the hexagonal P6_3/mmc space group. Pm(1) is bonded to twelve equivalent Ni(1) atoms to form a mixture of distorted corner and face-sharing PmNi12 cuboctahedra. Ni(1) is bonded in a 10-coordinate geometry to four equivalent Pm(1) and six equivalent Ni(1) atoms.
PmNi3 crystallizes in the hexagonal P6_3/mmc space group. Pm(1) is bonded to twelve equivalent Ni(1) atoms to form a mixture of distorted corner and face-sharing PmNi12 cuboctahedra. There are six shorter (2.87 Å) and six longer (2.91 Å) Pm(1)-Ni(1) bond lengths. Ni(1) is bonded in a 10-coordinate geometry to four equivalent Pm(1) and six equivalent Ni(1) atoms. There are two shorter (2.41 Å) and four longer (2.52 Å) Ni(1)-Ni(1) bond lengths.