Materials Data on LiV(SiO3)2 by Materials Project

Abstract

LiVSi2O6 is Esseneite structured and crystallizes in the monoclinic Cc space group. The structure is three-dimensional. Li1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Li–O bond distances ranging from 2.07–2.53 Å. V3+ is bonded to six O2- atoms to form VO6 octahedra that share corners with six SiO4 tetrahedra and edges with two equivalent VO6 octahedra. There are a spread of V–O bond distances ranging from 1.96–2.12 Å. There are two inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with three equivalent VO6 octahedra and corners with two equivalent SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 34–59°. There is one shorter (1.62 Å) and three longer (1.65 Å) Si–O bond length. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with three equivalent VO6 octahedra and corners with two equivalent SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 33–59°. There is one shorter (1.61 Å) and three longer (1.65 Å) Si–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded to one Li1+, two equivalent V3+, and one Si4+ atom to form a mixture of distorted edge and corner-sharing OLiV2Si trigonal pyramids. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Li1+ and two equivalent Si4+ atoms. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Li1+ and two equivalent Si4+ atoms. In the fourth O2- site, O2- is bonded in a distorted T-shaped geometry to one Li1+, one V3+, and one Si4+ atom. In the fifth O2- site, O2- is bonded to one Li1+, two equivalent V3+, and one Si4+ atom to form a mixture of distorted edge and corner-sharing OLiV2Si trigonal pyramids. In the sixth O2- site, O2- is bonded in a distorted T-shaped geometry to one Li1+, one V3+, and one Si4+ atom.