DOE OSTI2020
Li2RhO3 is Caswellsilverite-like structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are three 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 LiO6 octahedra, corners with four equivalent RhO6 octahedra, edges with four equivalent RhO6 octahedra, and edges with eight LiO6 octahedra. The corner-sharing octahedra tilt angles range from 4–6°. There are two shorter (2.08 Å) and four longer (2.19 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 LiO6 octahedra, corners with four equivalent RhO6 octahedra, edges with four equivalent RhO6 octahedra, and edges with eight LiO6 octahedra. The corner-sharing octahedral tilt angles are 5°. There are a spread of Li–O bond distances ranging from 2.12–2.17 Å. In the third Li1+ site, Li1+ is bonded to six O2- atoms to form LiO6 octahedra that share corners with six LiO6 octahedra, edges with six LiO6 octahedra, and edges with six equivalent RhO6 octahedra. The corner-sharing octahedra tilt angles range from 5–6°. There are two shorter (2.12 Å) and four longer (2.13 Å) Li–O bond lengths. Rh4+ is bonded to six O2- atoms to form RhO6 octahedra that share corners with six LiO6 octahedra, edges with three equivalent RhO6 octahedra, and edges with nine LiO6 octahedra. The corner-sharing octahedra tilt angles range from 4–5°. There are four shorter (2.03 Å) and two longer (2.04 Å) Rh–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to four Li1+ and two equivalent Rh4+ atoms to form a mixture of corner and edge-sharing OLi4Rh2 octahedra. The corner-sharing octahedra tilt angles range from 0–6°. In the second O2- site, O2- is bonded to four Li1+ and two equivalent Rh4+ atoms to form a mixture of corner and edge-sharing OLi4Rh2 octahedra. The corner-sharing octahedra tilt angles range from 0–3°.