Materials Data on SrCu9Sn4 by Materials Project
SrCu9Sn4 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. Sr is bonded in a 8-coordinate geometry to sixteen Cu and eight equivalent Sn atoms. There are eight shorter (3.64 Å) and eight longer (3.66 Å) Sr–Cu bond lengths. All Sr–Sn bond lengths are 3.55 Å. There are three inequivalent Cu sites. In the first Cu site, Cu is bonded to two equivalent Sr, six Cu, and four equivalent Sn atoms to form a mixture of distorted edge, face, and corner-sharing CuSr2Cu6Sn4 cuboctahedra. There are a spread of Cu–Cu bond distances ranging from 2.57–2.78 Å. There are a spread of Cu–Sn bond distances ranging from 2.62–2.71 Å. In the second Cu site, Cu is bonded in a 12-coordinate geometry to two equivalent Sr, six Cu, and four equivalent Sn atoms. There are a spread of Cu–Cu bond distances ranging from 2.59–2.97 Å. There are two shorter (2.76 Å) and two longer (2.80 Å) Cu–Sn bond lengths. In the third Cu site, Cu is bonded to eight Cu and four equivalent Sn atoms to form a mixture of face and corner-sharing CuCu8Sn4 cuboctahedra. All Cu–Sn bond lengths are 2.76 Å. Sn is bonded in a 11-coordinate geometry to two equivalent Sr and nine Cu atoms.