Materials Data on CoAu4 by Materials Project
CoAu4 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Co2+ is bonded in a distorted hexagonal planar geometry to six equivalent Au+0.50- atoms. All Co–Au bond lengths are 2.69 Å. There are five inequivalent Au+0.50- sites. In the first Au+0.50- site, Au+0.50- is bonded in a 12-coordinate geometry to three equivalent Co2+ and three equivalent Au+0.50- atoms. All Au–Au bond lengths are 3.00 Å. In the second Au+0.50- site, Au+0.50- is bonded to twelve Au+0.50- atoms to form a mixture of corner, edge, and face-sharing AuAu12 cuboctahedra. There are six shorter (2.91 Å) and three longer (3.00 Å) Au–Au bond lengths. In the third Au+0.50- site, Au+0.50- is bonded to twelve Au+0.50- atoms to form a mixture of corner, edge, and face-sharing AuAu12 cuboctahedra. There are six shorter (2.91 Å) and six longer (3.00 Å) Au–Au bond lengths. In the fourth Au+0.50- site, Au+0.50- is bonded to sixteen Au+0.50- atoms to form a mixture of corner, edge, and face-sharing AuAu16 cuboctahedra. There are a spread of Au–Au bond distances ranging from 2.91–5.81 Å. In the fifth Au+0.50- site, Au+0.50- is bonded in a 12-coordinate geometry to three equivalent Co2+ and three equivalent Au+0.50- atoms. All Au–Co bond lengths are 2.69 Å.