Materials Data on V6Si7Ni16 by Materials Project
V6Ni16Si7 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. V2+ is bonded in a 4-coordinate geometry to four equivalent Si4- atoms. All V–Si bond lengths are 2.84 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 to four equivalent V2+ and eight Ni1+ atoms to form a mixture of corner and face-sharing SiV4Ni8 cuboctahedra. In the second Si4- site, Si4- is bonded in a body-centered cubic geometry to eight equivalent Ni1+ atoms.