PrAl crystallizes in the orthorhombic Cmcm space group. Pr(1) is bonded in a 8-coordinate geometry to four equivalent Al(1) and four equivalent Al(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to eight equivalent Pr(1) and two equivalent Al(2) atoms. In the second Al site, Al(2) is bonded to eight equivalent Pr(1), two equivalent Al(1), and two equivalent Al(2) atoms to form a mixture of corner, face, and edge-sharing AlPr8Al4 cuboctahedra.
PrAl crystallizes in the orthorhombic Cmcm space group. Pr(1) is bonded in a 8-coordinate geometry to four equivalent Al(1) and four equivalent Al(2) atoms. There are a spread of Pr(1)-Al(1) bond distances ranging from 3.19-3.33 Å. There are two shorter (3.42 Å) and two longer (3.54 Å) Pr(1)-Al(2) bond lengths. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to eight equivalent Pr(1) and two equivalent Al(2) atoms. Both Al(1)-Al(2) bond lengths are 2.73 Å. In the second Al site, Al(2) is bonded to eight equivalent Pr(1), two equivalent Al(1), and two equivalent Al(2) atoms to form a mixture of corner, face, and edge-sharing AlPr8Al4 cuboctahedra. Both Al(2)-Al(2) bond lengths are 2.87 Å.