Materials Data on Li2CeO3 by Materials Project

Abstract

Li2CeO3 is Caswellsilverite-like structured and crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to six O2- atoms to form LiO6 octahedra that share corners with two equivalent CeO6 octahedra, corners with four LiO6 octahedra, edges with five equivalent CeO6 octahedra, and edges with seven LiO6 octahedra. The corner-sharing octahedra tilt angles range from 0–11°. There are two shorter (2.16 Å) and four longer (2.45 Å) Li–O bond lengths. In the second Li1+ site, Li1+ is bonded to six O2- atoms to form LiO6 octahedra that share corners with two equivalent CeO6 octahedra, corners with four LiO6 octahedra, edges with five equivalent CeO6 octahedra, and edges with seven LiO6 octahedra. The corner-sharing octahedra tilt angles range from 0–11°. There are a spread of Li–O bond distances ranging from 2.10–2.63 Å. Ce4+ is bonded to six O2- atoms to form CeO6 octahedra that share corners with two equivalent CeO6 octahedra, corners with four LiO6 octahedra, edges with two equivalent CeO6 octahedra, and edges with ten LiO6 octahedra. The corner-sharing octahedra tilt angles range from 0–9°. There are a spread of Ce–O bond distances ranging from 2.21–2.29 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to four Li1+ and two equivalent Ce4+ atoms to form a mixture of distorted edge and corner-sharing OLi4Ce2 octahedra. The corner-sharing octahedra tilt angles range from 2–10°. In the second O2- site, O2- is bonded to four Li1+ and two equivalent Ce4+ atoms to form a mixture of edge and corner-sharing OLi4Ce2 octahedra. The corner-sharing octahedra tilt angles range from 5–7°.