DOE OSTI2020
LiCr2(SO4)3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Li1+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Li–O bond distances ranging from 1.95–2.05 Å. There are two inequivalent Cr+2.50+ sites. In the first Cr+2.50+ site, Cr+2.50+ is bonded to six O2- atoms to form CrO6 octahedra that share corners with six SO4 tetrahedra. There are a spread of Cr–O bond distances ranging from 2.02–2.07 Å. In the second Cr+2.50+ site, Cr+2.50+ is bonded to six O2- atoms to form CrO6 octahedra that share corners with six SO4 tetrahedra. There are a spread of Cr–O bond distances ranging from 2.05–2.32 Å. There are three inequivalent S6+ sites. In the first S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with four CrO6 octahedra. The corner-sharing octahedra tilt angles range from 30–45°. There are a spread of S–O bond distances ranging from 1.46–1.50 Å. In the second S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with four CrO6 octahedra. The corner-sharing octahedra tilt angles range from 14–45°. There are a spread of S–O bond distances ranging from 1.45–1.51 Å. In the third S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with four CrO6 octahedra. The corner-sharing octahedra tilt angles range from 17–46°. There is one shorter (1.47 Å) and three longer (1.49 Å) S–O bond length. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to one Li1+, one Cr+2.50+, and one S6+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to one Li1+, one Cr+2.50+, and one S6+ atom. In the third O2- site, O2- is bonded in a distorted linear geometry to one Cr+2.50+ and one S6+ atom. In the fourth O2- site, O2- is bonded in a bent 150 degrees geometry to one Cr+2.50+ and one S6+ atom. In the fifth O2- site, O2- is bonded in a bent 150 degrees geometry to one Cr+2.50+ and one S6+ atom. In the sixth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Cr+2.50+ and one S6+ atom. In the seventh O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Li1+, one Cr+2.50+, and one S6+ atom. In the eighth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Cr+2.50+ and one S6+ atom. In the ninth O2- site, O2- is bonded in a bent 150 degrees geometry to one Cr+2.50+ and one S6+ atom. In the tenth O2- site, O2- is bonded in a 2-coordinate geometry to one Cr+2.50+ and one S6+ atom. In the eleventh O2- site, O2- is bonded in a distorted linear geometry to one Cr+2.50+ and one S6+ atom. In the twelfth O2- site, O2- is bonded in a 2-coordinate geometry to one Li1+, one Cr+2.50+, and one S6+ atom.