Materials Data on V(FeSe2)2 by Materials Project

Abstract

V(FeSe2)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. V2+ is bonded to six Se2- atoms to form VSe6 octahedra that share corners with twelve equivalent FeSe6 octahedra, edges with two equivalent VSe6 octahedra, and faces with two equivalent FeSe6 octahedra. The corner-sharing octahedra tilt angles range from 51–56°. There are two shorter (2.53 Å) and four longer (2.54 Å) V–Se bond lengths. Fe3+ is bonded to six Se2- atoms to form distorted FeSe6 octahedra that share corners with six equivalent VSe6 octahedra, edges with six equivalent FeSe6 octahedra, and a faceface with one VSe6 octahedra. The corner-sharing octahedra tilt angles range from 51–56°. There are a spread of Fe–Se bond distances ranging from 2.41–2.79 Å. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 4-coordinate geometry to one V2+ and three equivalent Fe3+ atoms. In the second Se2- site, Se2- is bonded in a 5-coordinate geometry to two equivalent V2+ and three equivalent Fe3+ atoms.