Materials Data on CoNiSe4 by Materials Project
CoNiSe4 is pyrite-derived structured and crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Co4+ is bonded to six Se2- atoms to form CoSe6 octahedra that share corners with four equivalent CoSe6 octahedra and corners with eight equivalent NiSe6 octahedra. The corner-sharing octahedra tilt angles range from 62–64°. There are two shorter (2.40 Å) and four longer (2.42 Å) Co–Se bond lengths. Ni4+ is bonded to six Se2- atoms to form NiSe6 octahedra that share corners with four equivalent NiSe6 octahedra and corners with eight equivalent CoSe6 octahedra. The corner-sharing octahedra tilt angles range from 62–65°. There are a spread of Ni–Se bond distances ranging from 2.45–2.50 Å. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 3-coordinate geometry to one Co4+ and two equivalent Ni4+ atoms. In the second Se2- site, Se2- is bonded in a 3-coordinate geometry to two equivalent Co4+ and one Ni4+ atom.