Materials Data on BaGdFe4O7 by Materials Project

Abstract

BaGdFe4O7 crystallizes in the orthorhombic Cmc2_1 space group. The structure is three-dimensional. Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.79–3.34 Å. Gd3+ is bonded to six O2- atoms to form GdO6 octahedra that share corners with twelve FeO4 tetrahedra. There are a spread of Gd–O bond distances ranging from 2.28–2.41 Å. There are three inequivalent Fe+2.25+ sites. In the first Fe+2.25+ site, Fe+2.25+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with three equivalent GdO6 octahedra and corners with six FeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 52–56°. There are a spread of Fe–O bond distances ranging from 1.90–1.93 Å. In the second Fe+2.25+ site, Fe+2.25+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with three equivalent GdO6 octahedra and corners with six FeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 56–57°. There are a spread of Fe–O bond distances ranging from 1.99–2.09 Å. In the third Fe+2.25+ site, Fe+2.25+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with three equivalent GdO6 octahedra and corners with six FeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 52–57°. There are a spread of Fe–O bond distances ranging from 2.00–2.11 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded to four Fe+2.25+ atoms to form corner-sharing OFe4 tetrahedra. In the second O2- site, O2- is bonded in a 4-coordinate geometry to one Ba2+, one Gd3+, and two equivalent Fe+2.25+ atoms. In the third O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ba2+, one Gd3+, and two Fe+2.25+ atoms. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ba2+, one Gd3+, and two Fe+2.25+ atoms. In the fifth O2- site, O2- is bonded to one Ba2+, one Gd3+, and two Fe+2.25+ atoms to form distorted OBaGdFe2 trigonal pyramids that share corners with two equivalent OFe4 tetrahedra, a cornercorner with one OBaGdFe2 trigonal pyramid, and an edgeedge with one OBaGdFe2 trigonal pyramid.