Materials Data on LiCu2F5 by Materials Project

Abstract

LiCu2F5 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Li1+ is bonded to six F1- atoms to form distorted LiF6 octahedra that share corners with two equivalent LiF6 octahedra, corners with two CuF6 octahedra, and edges with six CuF6 octahedra. The corner-sharing octahedra tilt angles range from 34–50°. There are a spread of Li–F bond distances ranging from 1.92–2.26 Å. There are two inequivalent Cu2+ sites. In the first Cu2+ site, Cu2+ is bonded to six F1- atoms to form distorted CuF6 octahedra that share a cornercorner with one LiF6 octahedra, corners with three CuF6 octahedra, edges with three equivalent LiF6 octahedra, and edges with three equivalent CuF6 octahedra. The corner-sharing octahedra tilt angles range from 25–53°. There are a spread of Cu–F bond distances ranging from 1.92–2.42 Å. In the second Cu2+ site, Cu2+ is bonded to six F1- atoms to form distorted CuF6 octahedra that share a cornercorner with one LiF6 octahedra, corners with three CuF6 octahedra, edges with three equivalent LiF6 octahedra, and edges with three equivalent CuF6 octahedra. The corner-sharing octahedra tilt angles range from 24–53°. There are a spread of Cu–F bond distances ranging from 1.93–2.43 Å. There are five inequivalent F1- sites. In the first F1- site, F1- is bonded in a 3-coordinate geometry to one Li1+ and two equivalent Cu2+ atoms. In the second F1- site, F1- is bonded in a 3-coordinate geometry to one Li1+ and two equivalent Cu2+ atoms. In the third F1- site, F1- is bonded to one Li1+ and three equivalent Cu2+ atoms to form distorted FLiCu3 trigonal pyramids that share a cornercorner with one FLi2Cu2 tetrahedra, corners with three FLiCu3 trigonal pyramids, edges with two equivalent FLi2Cu2 tetrahedra, and edges with two equivalent FLiCu3 trigonal pyramids. In the fourth F1- site, F1- is bonded to one Li1+ and three equivalent Cu2+ atoms to form distorted FLiCu3 trigonal pyramids that share a cornercorner with one FLi2Cu2 tetrahedra, corners with three FLiCu3 trigonal pyramids, edges with two equivalent FLi2Cu2 tetrahedra, and edges with two equivalent FLiCu3 trigonal pyramids. In the fifth F1- site, F1- is bonded to two equivalent Li1+ and two Cu2+ atoms to form distorted FLi2Cu2 tetrahedra that share corners with two equivalent FLi2Cu2 tetrahedra, corners with two FLiCu3 trigonal pyramids, and edges with four FLiCu3 trigonal pyramids.