Materials Data on Ba5AlIr2O11 by Materials Project
Ba5Ir2AlO11 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are five inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 11-coordinate geometry to eleven O2- atoms. There are a spread of Ba–O bond distances ranging from 2.74–3.06 Å. In the second Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.56–3.11 Å. In the third Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.61–3.17 Å. In the fourth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.80–3.13 Å. In the fifth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.72–2.93 Å. There are two inequivalent Ir+4.50+ sites. In the first Ir+4.50+ site, Ir+4.50+ is bonded to six O2- atoms to form face-sharing IrO6 octahedra. There are a spread of Ir–O bond distances ranging from 1.96–2.10 Å. In the second Ir+4.50+ site, Ir+4.50+ is bonded to six O2- atoms to form IrO6 octahedra that share corners with two equivalent AlO4 tetrahedra and a faceface with one IrO6 octahedra. There are a spread of Ir–O bond distances ranging from 1.96–2.08 Å. Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with two equivalent IrO6 octahedra. The corner-sharing octahedral tilt angles are 13°. There are a spread of Al–O bond distances ranging from 1.75–1.78 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded to four Ba2+ and two Ir+4.50+ atoms to form distorted OBa4Ir2 octahedra that share corners with two equivalent OBa4Ir2 octahedra, a cornercorner with one OBa4Ir square pyramid, and edges with two equivalent OBa4Ir2 octahedra. The corner-sharing octahedral tilt angles are 7°. In the second O2- site, O2- is bonded in a 2-coordinate geometry to four Ba2+, one Ir+4.50+, and one Al3+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to four Ba2+ and one Al3+ atom. In the fourth O2- site, O2- is bonded in a 6-coordinate geometry to four Ba2+ and two Ir+4.50+ atoms. In the fifth O2- site, O2- is bonded in a 5-coordinate geometry to four Ba2+ and one Al3+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to five Ba2+ and one Ir+4.50+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to four Ba2+ and one Ir+4.50+ atom. In the eighth O2- site, O2- is bonded to four Ba2+ and one Ir+4.50+ atom to form distorted OBa4Ir square pyramids that share a cornercorner with one OBa4Ir2 octahedra and corners with two equivalent OBa4Ir square pyramids. The corner-sharing octahedral tilt angles are 3°.