Materials Data on Al2Fe2Bi2O9 by Materials Project

Fe2Al2Bi2O9 crystallizes in the orthorhombic Pbam space group. The structure is three-dimensional. Fe3+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with four equivalent AlO6 octahedra and a cornercorner with one FeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 50–58°. There are a spread of Fe–O bond distances ranging from 1.86–1.92 Å. Al3+ is bonded to six O2- atoms to form AlO6 octahedra that share corners with four equivalent FeO4 tetrahedra and edges with two equivalent AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.90–1.98 Å. Bi3+ is bonded in a 4-coordinate geometry to six O2- atoms. There are a spread of Bi–O bond distances ranging from 2.15–3.02 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to one Fe3+, one Al3+, and two equivalent Bi3+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Al3+ and two equivalent Bi3+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to one Fe3+ and two equivalent Al3+ atoms. In the fourth O2- site, O2- is bonded in a linear geometry to two equivalent Fe3+ atoms.