DOI: 10.17188/1306734
title: Materials Data on Li2FeO2F by Materials Project

description: Li2FeO2F is Caswellsilverite-derived structured and crystallizes in the monoclinic Cc space group. The structure is three-dimensional. there are four inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to four O2- and two F1- atoms to form LiO4F2 octahedra that share corners with two equivalent FeO4F2 octahedra, corners with four LiO4F2 octahedra, edges with five FeO4F2 octahedra, and edges with seven LiO4F2 octahedra. The corner-sharing octahedra tilt angles range from 1–12°. There are a spread of Li–O bond distances ranging from 2.08–2.12 Å. There are one shorter (2.31 Å) and one longer (2.37 Å) Li–F bond lengths. In the second Li1+ site, Li1+ is bonded to four O2- and two F1- atoms to form LiO4F2 octahedra that share corners with two equivalent LiO4F2 octahedra, corners with four FeO4F2 octahedra, edges with four FeO4F2 octahedra, and edges with eight LiO4F2 octahedra. The corner-sharing octahedra tilt angles range from 1–18°. There are a spread of Li–O bond distances ranging from 2.08–2.33 Å. There are one shorter (2.21 Å) and one longer (2.24 Å) Li–F bond lengths. In the third Li1+ site, Li1+ is bonded to four O2- and two F1- atoms to form LiO4F2 octahedra that share corners with two equivalent LiO4F2 octahedra, corners with four FeO4F2 octahedra, edges with four FeO4F2 octahedra, and edges with eight LiO4F2 octahedra. The corner-sharing octahedra tilt angles range from 3–9°. There are two shorter (2.12 Å) and two longer (2.14 Å) Li–O bond lengths. There are one shorter (2.11 Å) and one longer (2.13 Å) Li–F bond lengths. In the fourth Li1+ site, Li1+ is bonded to four O2- and two F1- atoms to form LiO4F2 octahedra that share corners with two equivalent FeO4F2 octahedra, corners with four LiO4F2 octahedra, edges with five FeO4F2 octahedra, and edges with seven LiO4F2 octahedra. The corner-sharing octahedra tilt angles range from 1–12°. There are a spread of Li–O bond distances ranging from 2.11–2.15 Å. There are one shorter (2.17 Å) and one longer (2.18 Å) Li–F bond lengths. There are two inequivalent Fe3+ sites. In the first Fe3+ site, Fe3+ is bonded to four O2- and two F1- atoms to form FeO4F2 octahedra that share corners with six LiO4F2 octahedra, edges with three equivalent FeO4F2 octahedra, and edges with nine LiO4F2 octahedra. The corner-sharing octahedra tilt angles range from 3–9°. There are a spread of Fe–O bond distances ranging from 1.98–2.05 Å. Both Fe–F bond lengths are 2.09 Å. In the second Fe3+ site, Fe3+ is bonded to four O2- and two F1- atoms to form FeO4F2 octahedra that share corners with six LiO4F2 octahedra, edges with three equivalent FeO4F2 octahedra, and edges with nine LiO4F2 octahedra. The corner-sharing octahedra tilt angles range from 1–18°. There is two shorter (1.94 Å) and two longer (1.99 Å) Fe–O bond length. There are one shorter (2.28 Å) and one longer (2.29 Å) Fe–F bond lengths. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to four Li1+ and two Fe3+ atoms to form OLi4Fe2 octahedra that share corners with two equivalent FLi4Fe2 octahedra, corners with four OLi4Fe2 octahedra, edges with five FLi4Fe2 octahedra, and edges with seven OLi4Fe2 octahedra. The corner-sharing octahedra tilt angles range from 3–15°. In the second O2- site, O2- is bonded to four Li1+ and two Fe3+ atoms to form OLi4Fe2 octahedra that share corners with two equivalent FLi4Fe2 octahedra, corners with four OLi4Fe2 octahedra, edges with five FLi4Fe2 octahedra, and edges with seven OLi4Fe2 octahedra. The corner-sharing octahedra tilt angles range from 3–19°. In the third O2- site, O2- is bonded to four Li1+ and two Fe3+ atoms to form OLi4Fe2 octahedra that share corners with two equivalent FLi4Fe2 octahedra, corners with four OLi4Fe2 octahedra, edges with five FLi4Fe2 octahedra, and edges with seven OLi4Fe2 octahedra. The corner-sharing octahedra tilt angles range from 3–19°. In the fourth O2- site, O2- is bonded to four Li1+ and two Fe3+ atoms to form OLi4Fe2 octahedra that share corners with two equivalent FLi4Fe2 octahedra, corners with four OLi4Fe2 octahedra, edges with five FLi4Fe2 octahedra, and edges with seven OLi4Fe2 octahedra. The corner-sharing octahedra tilt angles range from 3–15°. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded to four Li1+ and two Fe3+ atoms to form FLi4Fe2 octahedra that share corners with two equivalent FLi4Fe2 octahedra, corners with four OLi4Fe2 octahedra, edges with two equivalent FLi4Fe2 octahedra, and edges with ten OLi4Fe2 octahedra. The corner-sharing octahedra tilt angles range from 0–10°. In the second F1- site, F1- is bonded to four Li1+ and two Fe3+ atoms to form FLi4Fe2 octahedra that share corners with two equivalent FLi4Fe2 octahedra, corners with four OLi4Fe2 octahedra, edges with two equivalent FLi4Fe2 octahedra, and edges with ten OLi4Fe2 octahedra. The corner-sharing octahedra tilt angles range from 0–9°.