Materials Data on MgFe2O3 by Materials Project

Abstract

MgOFe2O2 is Caswellsilverite-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Mg2+ is bonded to six O2- atoms to form MgO6 octahedra that share corners with two equivalent FeO6 octahedra, corners with four equivalent MgO6 octahedra, edges with four equivalent MgO6 octahedra, and edges with eight equivalent FeO6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are two shorter (2.08 Å) and four longer (2.23 Å) Mg–O bond lengths. Fe2+ is bonded to six O2- atoms to form FeO6 octahedra that share a cornercorner with one MgO6 octahedra, corners with five equivalent FeO6 octahedra, edges with four equivalent MgO6 octahedra, and edges with eight equivalent FeO6 octahedra. The corner-sharing octahedra tilt angles range from 0–2°. There are a spread of Fe–O bond distances ranging from 2.11–2.23 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Mg2+ and two equivalent Fe2+ atoms to form a mixture of edge and corner-sharing OMg4Fe2 octahedra. The corner-sharing octahedral tilt angles are 0°. Both O–Fe bond lengths are 2.12 Å. In the second O2- site, O2- is bonded to one Mg2+ and five equivalent Fe2+ atoms to form a mixture of edge and corner-sharing OMgFe5 octahedra. The corner-sharing octahedra tilt angles range from 0–2°. In the third O2- site, O2- is bonded to four equivalent Mg2+ and two equivalent Fe2+ atoms to form a mixture of edge and corner-sharing OMg4Fe2 octahedra. The corner-sharing octahedral tilt angles are 0°. All O–Mg bond lengths are 2.23 Å.