Materials Data on Li2VFeS4 by Materials Project
Li2VFeS4 is Caswellsilverite-derived structured and crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Li1+ is bonded to six S2- atoms to form LiS6 octahedra that share corners with six equivalent VS6 octahedra, corners with six equivalent FeS6 octahedra, edges with six equivalent LiS6 octahedra, a faceface with one VS6 octahedra, and a faceface with one FeS6 octahedra. The corner-sharing octahedra tilt angles range from 46–48°. All Li–S bond lengths are 2.59 Å. V3+ is bonded to six equivalent S2- atoms to form VS6 octahedra that share corners with twelve equivalent LiS6 octahedra, edges with six equivalent VS6 octahedra, and faces with two equivalent LiS6 octahedra. The corner-sharing octahedral tilt angles are 46°. All V–S bond lengths are 2.40 Å. Fe3+ is bonded to six equivalent S2- atoms to form FeS6 octahedra that share corners with twelve equivalent LiS6 octahedra, edges with six equivalent FeS6 octahedra, and faces with two equivalent LiS6 octahedra. The corner-sharing octahedral tilt angles are 48°. All Fe–S bond lengths are 2.29 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 6-coordinate geometry to three equivalent Li1+ and three equivalent Fe3+ atoms. In the second S2- site, S2- is bonded to three equivalent Li1+ and three equivalent V3+ atoms to form a mixture of distorted edge and corner-sharing SLi3V3 pentagonal pyramids.