Materials Data on Ba2CeTaO6 by Materials Project
Ba2CeTaO6 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Ba2+ is bonded in a 12-coordinate geometry to twelve O2- atoms. There are a spread of Ba–O bond distances ranging from 2.78–3.39 Å. Ce3+ is bonded to six O2- atoms to form CeO6 octahedra that share corners with six equivalent TaO6 octahedra. The corner-sharing octahedra tilt angles range from 13–17°. There are four shorter (2.34 Å) and two longer (2.35 Å) Ce–O bond lengths. Ta5+ is bonded to six O2- atoms to form TaO6 octahedra that share corners with six equivalent CeO6 octahedra. The corner-sharing octahedra tilt angles range from 13–17°. All Ta–O bond lengths are 2.02 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to four equivalent Ba2+, one Ce3+, and one Ta5+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to four equivalent Ba2+, one Ce3+, and one Ta5+ atom.