PmAl3 crystallizes in the hexagonal P6_3/mmc space group. Pm(1) is bonded to twelve equivalent Al(1) atoms to form a mixture of distorted face and corner-sharing PmAl12 cuboctahedra. Al(1) is bonded in a 10-coordinate geometry to four equivalent Pm(1) and six equivalent Al(1) atoms.
PmAl3 crystallizes in the hexagonal P6_3/mmc space group. Pm(1) is bonded to twelve equivalent Al(1) atoms to form a mixture of distorted face and corner-sharing PmAl12 cuboctahedra. There are six shorter (3.15 Å) and six longer (3.24 Å) Pm(1)-Al(1) bond lengths. Al(1) is bonded in a 10-coordinate geometry to four equivalent Pm(1) and six equivalent Al(1) atoms. There are two shorter (2.72 Å) and four longer (2.78 Å) Al(1)-Al(1) bond lengths.