Materials Data on Ba4La4Co8O23 by Materials Project

Abstract

Ba4La4Co8O23 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded to twelve O2- atoms to form BaO12 cuboctahedra that share corners with four equivalent BaO12 cuboctahedra, faces with four BaO12 cuboctahedra, faces with six CoO6 octahedra, and faces with two equivalent CoO5 square pyramids. There are a spread of Ba–O bond distances ranging from 2.79–3.00 Å. In the second Ba2+ site, Ba2+ is bonded to twelve O2- atoms to form BaO12 cuboctahedra that share corners with four equivalent BaO12 cuboctahedra, faces with four BaO12 cuboctahedra, faces with six CoO6 octahedra, and faces with two equivalent CoO5 square pyramids. There are a spread of Ba–O bond distances ranging from 2.80–3.04 Å. La3+ is bonded in a 11-coordinate geometry to eleven O2- atoms. There are a spread of La–O bond distances ranging from 2.59–2.91 Å. There are four inequivalent Co+3.25+ sites. In the first Co+3.25+ site, Co+3.25+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with five CoO6 octahedra, a cornercorner with one CoO5 square pyramid, and faces with four BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 0–9°. There are a spread of Co–O bond distances ranging from 1.88–2.09 Å. In the second Co+3.25+ site, Co+3.25+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with four CoO6 octahedra, corners with two equivalent CoO5 square pyramids, and faces with four BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 5–9°. There are a spread of Co–O bond distances ranging from 1.80–2.09 Å. In the third Co+3.25+ site, Co+3.25+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with four CoO6 octahedra, corners with two equivalent CoO5 square pyramids, and faces with four BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 0–8°. There are a spread of Co–O bond distances ranging from 1.92–2.11 Å. In the fourth Co+3.25+ site, Co+3.25+ is bonded to five O2- atoms to form CoO5 square pyramids that share corners with five CoO6 octahedra and faces with four BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 2–18°. There are a spread of Co–O bond distances ranging from 1.90–2.11 Å. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a 6-coordinate geometry to two equivalent Ba2+, two equivalent La3+, and two Co+3.25+ atoms. In the second O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ba2+, two equivalent La3+, and two Co+3.25+ atoms. In the third O2- site, O2- is bonded in a 6-coordinate geometry to two equivalent Ba2+, two equivalent La3+, and two Co+3.25+ atoms. In the fourth O2- site, O2- is bonded in a 6-coordinate geometry to two equivalent Ba2+, two equivalent La3+, and two Co+3.25+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to two Ba2+, two equivalent La3+, and two Co+3.25+ atoms. In the sixth O2- site, O2- is bonded in a 6-coordinate geometry to two Ba2+, two equivalent La3+, and two Co+3.25+ atoms. In the seventh O2- site, O2- is bonded in a 6-coordinate geometry to four Ba2+ and two Co+3.25+ atoms. In the eighth O2- site, O2- is bonded to four Ba2+ and two Co+3.25+ atoms to form a mixture of distorted edge and corner-sharing OBa4Co2 octahedra. The corner-sharing octahedral tilt angles are 0°. In the ninth O2- site, O2- is bonded in a distorted linear geometry to four equivalent La3+ and two Co+3.25+ atoms. In the tenth O2- site, O2- is bonded in a distorted linear geometry to four equivalent La3+ and two equivalent Co+3.25+ atoms.