Materials Data on BaO by Materials Project

Abstract

BaO is Molybdenum Carbide MAX Phase-like structured and crystallizes in the orthorhombic Pbcm space group. The structure is three-dimensional. there are five inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded to six equivalent O2- atoms to form a mixture of distorted edge and corner-sharing BaO6 pentagonal pyramids. The corner-sharing octahedra tilt angles range from 1–2°. There are a spread of Ba–O bond distances ranging from 2.80–2.85 Å. In the second Ba2+ site, Ba2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ba–O bond distances ranging from 2.68–3.08 Å. In the third Ba2+ site, Ba2+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing BaO6 octahedra. The corner-sharing octahedra tilt angles range from 2–3°. There are a spread of Ba–O bond distances ranging from 2.73–2.88 Å. In the fourth Ba2+ site, Ba2+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing BaO6 octahedra. The corner-sharing octahedra tilt angles range from 2–3°. There are a spread of Ba–O bond distances ranging from 2.74–2.88 Å. In the fifth Ba2+ site, Ba2+ is bonded to six equivalent O2- atoms to form edge-sharing BaO6 octahedra. There are four shorter (2.77 Å) and two longer (2.83 Å) Ba–O bond lengths. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to six Ba2+ atoms to form a mixture of edge, face, and corner-sharing OBa6 octahedra. The corner-sharing octahedra tilt angles range from 0–52°. In the second O2- site, O2- is bonded to six Ba2+ atoms to form a mixture of edge, face, and corner-sharing OBa6 octahedra. The corner-sharing octahedra tilt angles range from 1–52°. In the third O2- site, O2- is bonded to six Ba2+ atoms to form a mixture of edge and corner-sharing OBa6 octahedra. The corner-sharing octahedra tilt angles range from 1–2°. In the fourth O2- site, O2- is bonded to six Ba2+ atoms to form a mixture of edge, face, and corner-sharing OBa6 octahedra. The corner-sharing octahedra tilt angles range from 1–49°.