Materials Data on PrAlCu by Materials Project
PrCuAl crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. Pr is bonded in a 5-coordinate geometry to five Cu and six equivalent Al atoms. There are one shorter (2.96 Å) and four longer (3.03 Å) Pr–Cu bond lengths. There are two shorter (3.33 Å) and four longer (3.34 Å) Pr–Al bond lengths. There are two inequivalent Cu sites. In the first Cu site, Cu is bonded in a distorted q6 geometry to three equivalent Pr and six equivalent Al atoms. All Cu–Al bond lengths are 2.68 Å. In the second Cu site, Cu is bonded in a 9-coordinate geometry to six equivalent Pr and three equivalent Al atoms. All Cu–Al bond lengths are 2.84 Å. Al is bonded in a 12-coordinate geometry to six equivalent Pr, four Cu, and two equivalent Al atoms. Both Al–Al bond lengths are 2.81 Å.