Materials Data on Fe2OF3 by Materials Project
Fe2OF3 is zeta iron carbide-derived structured and crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are three 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 equivalent FeOF5 octahedra. The corner-sharing octahedra tilt angles range from 44–58°. The Fe–O bond length is 2.01 Å. All Fe–F bond lengths are 2.13 Å. In the second 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 1.91 Å. There are two shorter (2.03 Å) and two longer (2.17 Å) Fe–F bond lengths. In the third 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 47–50°. Both Fe–O bond lengths are 1.94 Å. There are two shorter (2.03 Å) and two longer (2.10 Å) Fe–F bond lengths. O2- is bonded in a trigonal planar geometry to three Fe+2.50+ atoms. There are three 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 3-coordinate 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.