Materials Data on Li2Fe(PO4)2 by Materials Project

Abstract

Li2Fe(PO4)2 crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. there are two inequivalent Li sites. In the first Li site, Li is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Li–O bond distances ranging from 2.00–2.55 Å. In the second Li site, Li is bonded in a 5-coordinate geometry to five O atoms. There are a spread of Li–O bond distances ranging from 1.96–2.58 Å. Fe is bonded to six O atoms to form FeO6 octahedra that share corners with six PO4 tetrahedra. There are a spread of Fe–O bond distances ranging from 1.98–2.10 Å. There are two inequivalent P sites. In the first P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with three equivalent FeO6 octahedra. The corner-sharing octahedra tilt angles range from 44–46°. There are a spread of P–O bond distances ranging from 1.54–1.57 Å. In the second P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with three equivalent FeO6 octahedra. The corner-sharing octahedra tilt angles range from 44–49°. There is three shorter (1.55 Å) and one longer (1.56 Å) P–O bond length. There are eight inequivalent O sites. In the first O site, O is bonded in a 3-coordinate geometry to one Li, one Fe, and one P atom. In the second O site, O is bonded in a 3-coordinate geometry to one Li, one Fe, and one P atom. In the third O site, O is bonded in a distorted trigonal non-coplanar geometry to two Li and one P atom. In the fourth O site, O is bonded in a 4-coordinate geometry to two Li, one Fe, and one P atom. In the fifth O site, O is bonded in a distorted trigonal planar geometry to one Li, one Fe, and one P atom. In the sixth O site, O is bonded in a 2-coordinate geometry to one Li, one Fe, and one P atom. In the seventh O site, O is bonded in a distorted trigonal non-coplanar geometry to one Li, one Fe, and one P atom. In the eighth O site, O is bonded in a trigonal planar geometry to two Li and one P atom.