Materials Data on Ba3SiO5 by Materials Project
Ba3SiO5 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are two inequivalent Ba2+ sites. In the first 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 2.71–2.98 Å. In the second Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are two shorter (2.85 Å) and eight longer (3.09 Å) Ba–O bond lengths. Si4+ is bonded in a tetrahedral geometry to four equivalent O2- atoms. All Si–O bond lengths are 1.66 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to five Ba2+ and one Si4+ atom. In the second O2- site, O2- is bonded to six Ba2+ atoms to form corner-sharing OBa6 octahedra. The corner-sharing octahedra tilt angles range from 0–30°.