Materials Data on BaSiO3 by Materials Project

Abstract

BaSiO3 is (Cubic) Perovskite-like structured and crystallizes in the hexagonal P6_3/mmc 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 nine BaO12 cuboctahedra, corners with three equivalent SiO6 octahedra, faces with seven BaO12 cuboctahedra, and faces with seven SiO6 octahedra. The corner-sharing octahedral tilt angles are 6°. There are a spread of Ba–O bond distances ranging from 2.75–2.82 Å. In the second Ba2+ site, Ba2+ is bonded to twelve O2- atoms to form BaO12 cuboctahedra that share corners with twelve BaO12 cuboctahedra, faces with six equivalent BaO12 cuboctahedra, and faces with eight SiO6 octahedra. There are six shorter (2.76 Å) and six longer (2.77 Å) Ba–O bond lengths. There are two inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to six O2- atoms to form SiO6 octahedra that share corners with three equivalent BaO12 cuboctahedra, corners with three equivalent SiO6 octahedra, faces with seven BaO12 cuboctahedra, and a faceface with one SiO6 octahedra. The corner-sharing octahedral tilt angles are 1°. There is three shorter (1.84 Å) and three longer (1.89 Å) Si–O bond length. In the second Si4+ site, Si4+ is bonded to six equivalent O2- atoms to form SiO6 octahedra that share corners with six equivalent SiO6 octahedra and faces with eight BaO12 cuboctahedra. The corner-sharing octahedral tilt angles are 1°. All Si–O bond lengths are 1.91 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to four Ba2+ and two Si4+ atoms. In the second O2- site, O2- is bonded in a distorted L-shaped geometry to four Ba2+ and two equivalent Si4+ atoms.