Materials Data on FeCo(NiS2)4 by Materials Project

FeCo(NiS2)4 is Spinel-derived structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. Fe3+ is bonded to four equivalent S2- atoms to form FeS4 tetrahedra that share corners with twelve equivalent NiS6 octahedra. The corner-sharing octahedral tilt angles are 56°. All Fe–S bond lengths are 2.11 Å. Co3+ is bonded to four equivalent S2- atoms to form CoS4 tetrahedra that share corners with twelve equivalent NiS6 octahedra. The corner-sharing octahedral tilt angles are 57°. All Co–S bond lengths are 2.13 Å. Ni+2.50+ is bonded to six S2- atoms to form NiS6 octahedra that share corners with three equivalent FeS4 tetrahedra, corners with three equivalent CoS4 tetrahedra, and edges with six equivalent NiS6 octahedra. There are three shorter (2.29 Å) and three longer (2.30 Å) Ni–S bond lengths. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to one Co3+ and three equivalent Ni+2.50+ atoms. In the second S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to one Fe3+ and three equivalent Ni+2.50+ atoms.