Materials Data on NdAl2Cu9 by Materials Project
NdCu9Al2 crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Nd is bonded in a 8-coordinate geometry to eighteen Cu atoms. There are a spread of Nd–Cu bond distances ranging from 3.17–3.31 Å. There are two inequivalent Cu sites. In the first Cu site, Cu is bonded in a 4-coordinate geometry to two equivalent Nd, eight equivalent Cu, and four equivalent Al atoms. All Cu–Cu bond lengths are 2.76 Å. All Cu–Al bond lengths are 2.67 Å. In the second Cu site, Cu is bonded in a 2-coordinate geometry to two equivalent Nd, eight Cu, and two equivalent Al atoms. There are a spread of Cu–Cu bond distances ranging from 2.49–2.83 Å. There are one shorter (2.49 Å) and one longer (2.51 Å) Cu–Al bond lengths. Al is bonded in a distorted q6 geometry to ten Cu atoms.