DOI: 10.17188/1701274
title: Materials Data on BaTi2Fe4O11 by Materials Project

description: BaTi2Fe4O11 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Ba2+ is bonded to twelve O2- atoms to form BaO12 cuboctahedra that share corners with six equivalent BaO12 cuboctahedra, edges with two equivalent TiO6 octahedra, edges with four FeO6 octahedra, edges with three equivalent TiO5 trigonal bipyramids, and faces with six equivalent FeO6 octahedra. There are a spread of Ba–O bond distances ranging from 2.80–2.99 Å. There are two inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with four equivalent FeO6 octahedra, corners with two equivalent TiO5 trigonal bipyramids, edges with two equivalent BaO12 cuboctahedra, and edges with four FeO6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are four shorter (1.96 Å) and two longer (2.04 Å) Ti–O bond lengths. In the second Ti4+ site, Ti4+ is bonded to five O2- atoms to form TiO5 trigonal bipyramids that share corners with two equivalent TiO6 octahedra, corners with ten FeO6 octahedra, and edges with three equivalent BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 41–57°. There are three shorter (1.85 Å) and two longer (2.16 Å) Ti–O bond lengths. There are three inequivalent Fe3+ sites. In the first Fe3+ site, Fe3+ is bonded to six O2- atoms to form distorted FeO6 octahedra that share corners with two equivalent TiO6 octahedra, corners with four FeO6 octahedra, corners with three equivalent TiO5 trigonal bipyramids, faces with three equivalent BaO12 cuboctahedra, and a faceface with one FeO6 octahedra. The corner-sharing octahedra tilt angles range from 53–57°. There are a spread of Fe–O bond distances ranging from 1.96–2.17 Å. In the second Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with four equivalent FeO6 octahedra, corners with two equivalent TiO5 trigonal bipyramids, edges with two equivalent BaO12 cuboctahedra, edges with two equivalent TiO6 octahedra, and edges with two equivalent FeO6 octahedra. The corner-sharing octahedra tilt angles range from 55–57°. There are a spread of Fe–O bond distances ranging from 2.00–2.11 Å. In the third Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with four equivalent FeO6 octahedra, corners with two equivalent TiO5 trigonal bipyramids, edges with two equivalent BaO12 cuboctahedra, edges with two equivalent TiO6 octahedra, and edges with two equivalent FeO6 octahedra. The corner-sharing octahedra tilt angles range from 55–57°. There are a spread of Fe–O bond distances ranging from 2.00–2.11 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to one Ba2+ and three Fe3+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Ba2+, one Ti4+, and two Fe3+ atoms. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Ba2+, one Ti4+, and two Fe3+ atoms. In the fourth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Ba2+, one Ti4+, and two equivalent Fe3+ atoms. In the fifth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Ba2+, one Ti4+, and two equivalent Fe3+ atoms. In the sixth O2- site, O2- is bonded in a rectangular see-saw-like geometry to two Ti4+ and two Fe3+ atoms.