DOI: 10.17188/1306841
title: Materials Data on Fe2OF3 by Materials Project

description: Fe2OF3 is zeta iron carbide-derived structured and crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. there are six inequivalent Fe+2.50+ sites. In the first Fe+2.50+ site, Fe+2.50+ is bonded to one O2- and five F1- atoms to form FeOF5 octahedra that share corners with eight FeO2F4 octahedra and edges with two FeOF5 octahedra. The corner-sharing octahedra tilt angles range from 47–54°. The Fe–O bond length is 2.05 Å. There are four shorter (2.11 Å) and one longer (2.18 Å) Fe–F bond lengths. In the second Fe+2.50+ site, Fe+2.50+ is bonded to one O2- and five F1- atoms to form FeOF5 octahedra that share corners with eight equivalent FeO2F4 octahedra and edges with two equivalent FeOF5 octahedra. The corner-sharing octahedra tilt angles range from 47–53°. The Fe–O bond length is 2.05 Å. There are four shorter (2.11 Å) and one longer (2.18 Å) Fe–F bond lengths. In the third Fe+2.50+ site, Fe+2.50+ is bonded to one O2- and five F1- atoms to form FeOF5 octahedra that share corners with eight FeO2F4 octahedra and edges with two FeOF5 octahedra. The corner-sharing octahedra tilt angles range from 44–58°. The Fe–O bond length is 2.05 Å. There are a spread of Fe–F bond distances ranging from 2.11–2.16 Å. In the fourth Fe+2.50+ site, Fe+2.50+ is bonded to two O2- and four F1- atoms to form FeO2F4 octahedra that share corners with eight FeOF5 octahedra and edges with two FeO2F4 octahedra. The corner-sharing octahedra tilt angles range from 47–54°. Both Fe–O bond lengths are 1.92 Å. There are a spread of Fe–F bond distances ranging from 2.07–2.10 Å. In the fifth Fe+2.50+ site, Fe+2.50+ is bonded to two O2- and four F1- atoms to form FeO2F4 octahedra that share corners with eight FeOF5 octahedra and edges with two FeO2F4 octahedra. The corner-sharing octahedra tilt angles range from 47–53°. There is one shorter (1.92 Å) and one longer (1.93 Å) Fe–O bond length. There are a spread of Fe–F bond distances ranging from 2.07–2.11 Å. In the sixth Fe+2.50+ site, Fe+2.50+ is bonded to two equivalent O2- and four F1- atoms to form FeO2F4 octahedra that share corners with eight equivalent FeOF5 octahedra and edges with two equivalent FeO2F4 octahedra. The corner-sharing octahedra tilt angles range from 44–58°. Both Fe–O bond lengths are 1.90 Å. There are two shorter (2.07 Å) and two longer (2.17 Å) Fe–F bond lengths. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to three Fe+2.50+ atoms. In the second O2- site, O2- is bonded in a trigonal planar geometry to three Fe+2.50+ atoms. In the third O2- site, O2- is bonded in a trigonal planar geometry to three Fe+2.50+ atoms. There are six inequivalent F1- sites. In the first F1- site, F1- is bonded in a 3-coordinate geometry to three Fe+2.50+ atoms. In the second F1- site, F1- is bonded in a distorted T-shaped geometry to three Fe+2.50+ atoms. In the third F1- site, F1- is bonded in a 3-coordinate geometry to three Fe+2.50+ atoms. In the fourth F1- site, F1- is bonded in a 3-coordinate geometry to three Fe+2.50+ atoms. In the fifth F1- site, F1- is bonded in a 3-coordinate geometry to three Fe+2.50+ atoms. In the sixth F1- site, F1- is bonded in a 3-coordinate geometry to three Fe+2.50+ atoms.