Materials Data on Li2SnP2O7 by Materials Project

Abstract

Li2SnP2O7 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to four O2- atoms to form LiO4 tetrahedra that share corners with two equivalent LiO4 tetrahedra, corners with four PO4 tetrahedra, and corners with three equivalent SnO5 trigonal bipyramids. There are a spread of Li–O bond distances ranging from 1.94–2.20 Å. In the second Li1+ site, Li1+ is bonded to four O2- atoms to form LiO4 tetrahedra that share corners with two equivalent LiO4 tetrahedra, corners with four PO4 tetrahedra, and corners with three equivalent SnO5 trigonal bipyramids. There are a spread of Li–O bond distances ranging from 1.92–2.39 Å. Sn2+ is bonded to five O2- atoms to form SnO5 trigonal bipyramids that share corners with five PO4 tetrahedra and corners with six LiO4 tetrahedra. There are a spread of Sn–O bond distances ranging from 2.35–2.60 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one PO4 tetrahedra, corners with four LiO4 tetrahedra, and corners with three equivalent SnO5 trigonal bipyramids. There are a spread of P–O bond distances ranging from 1.54–1.61 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one PO4 tetrahedra, corners with four LiO4 tetrahedra, and corners with two equivalent SnO5 trigonal bipyramids. There are a spread of P–O bond distances ranging from 1.52–1.68 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 120 degrees geometry to two P5+ atoms. In the second O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Li1+, one Sn2+, and one P5+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one Li1+, one Sn2+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to two Li1+, one Sn2+, and one P5+ atom. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to one Li1+, one Sn2+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to one Li1+, one Sn2+, and one P5+ atom. In the seventh O2- site, O2- is bonded in a distorted trigonal planar geometry to two Li1+ and one P5+ atom.