PrNiAl crystallizes in the hexagonal P-62m space group. Pr(1) is bonded in a 11-coordinate geometry to one Ni(2), four equivalent Ni(1), and six equivalent Al(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(2) is bonded in a distorted q6 geometry to three equivalent Pr(1) and six equivalent Al(1) atoms. In the second Ni site, Ni(1) is bonded in a 9-coordinate geometry to six equivalent Pr(1) and three equivalent Al(1) atoms. Al(1) is bonded to six equivalent Pr(1), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Al(1) atoms to form a mixture of distorted edge, face, and corner-sharing AlPr6Al2Ni4 cuboctahedra.
PrNiAl crystallizes in the hexagonal P-62m space group. Pr(1) is bonded in a 11-coordinate geometry to one Ni(2), four equivalent Ni(1), and six equivalent Al(1) atoms. The Pr(1)-Ni(2) bond length is 2.96 Å. All Pr(1)-Ni(1) bond lengths are 2.94 Å. There are two shorter (3.24 Å) and four longer (3.28 Å) Pr(1)-Al(1) bond lengths. There are two inequivalent Ni sites. In the first Ni site, Ni(2) is bonded in a distorted q6 geometry to three equivalent Pr(1) and six equivalent Al(1) atoms. All Ni(2)-Al(1) bond lengths are 2.59 Å. In the second Ni site, Ni(1) is bonded in a 9-coordinate geometry to six equivalent Pr(1) and three equivalent Al(1) atoms. All Ni(1)-Al(1) bond lengths are 2.81 Å. Al(1) is bonded to six equivalent Pr(1), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Al(1) atoms to form a mixture of distorted edge, face, and corner-sharing AlPr6Al2Ni4 cuboctahedra. Both Al(1)-Al(1) bond lengths are 2.74 Å.