Materials Data on Cr6Si7Ni16 by Materials Project
Cr6Ni16Si7 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Cr2+ is bonded in a 4-coordinate geometry to four equivalent Si4- atoms. All Cr–Si bond lengths are 2.85 Å. There are two inequivalent Ni1+ sites. In the first Ni1+ site, Ni1+ is bonded in a trigonal planar geometry to three equivalent Si4- atoms. All Ni–Si bond lengths are 2.26 Å. In the second Ni1+ site, Ni1+ is bonded to four Si4- atoms to form a mixture of corner and edge-sharing NiSi4 tetrahedra. There are one shorter (2.25 Å) and three longer (2.44 Å) Ni–Si bond lengths. There are two inequivalent Si4- sites. In the first Si4- site, Si4- is bonded in a body-centered cubic geometry to eight equivalent Ni1+ atoms. In the second Si4- site, Si4- is bonded to four equivalent Cr2+ and eight Ni1+ atoms to form a mixture of distorted corner and face-sharing SiCr4Ni8 cuboctahedra.