Materials Data on LiFeF3 by Materials Project

Abstract

LiFeF3 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. Li1+ is bonded in a 8-coordinate geometry to four equivalent F1- atoms. All Li–F bond lengths are 2.34 Å. Fe2+ is bonded to six F1- atoms to form corner-sharing FeF6 octahedra. The corner-sharing octahedra tilt angles range from 0–39°. There are two shorter (1.95 Å) and four longer (2.12 Å) Fe–F bond lengths. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded to two equivalent Li1+ and two equivalent Fe2+ atoms to form a mixture of distorted edge and corner-sharing FLi2Fe2 tetrahedra. In the second F1- site, F1- is bonded in a linear geometry to two equivalent Fe2+ atoms.