Materials Data on LiMg3(WO4)3 by Materials Project

Abstract

LiMg3(WO4)3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Li1+ is bonded to six O2- atoms to form distorted LiO6 pentagonal pyramids that share corners with two equivalent MgO6 octahedra, corners with two equivalent WO5 trigonal bipyramids, edges with two equivalent LiO6 pentagonal pyramids, and edges with four equivalent WO5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 66°. There are a spread of Li–O bond distances ranging from 2.13–2.29 Å. There are two inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded to six O2- atoms to form MgO6 octahedra that share corners with two equivalent WO4 tetrahedra, corners with four equivalent WO5 trigonal bipyramids, and faces with two equivalent MgO6 octahedra. There are a spread of Mg–O bond distances ranging from 2.03–2.09 Å. In the second Mg2+ site, Mg2+ is bonded to six O2- atoms to form MgO6 octahedra that share a cornercorner with one MgO6 octahedra, a cornercorner with one LiO6 pentagonal pyramid, corners with three equivalent WO4 tetrahedra, corners with three equivalent WO5 trigonal bipyramids, and edges with two equivalent MgO6 octahedra. The corner-sharing octahedral tilt angles are 54°. There are a spread of Mg–O bond distances ranging from 2.03–2.19 Å. There are two inequivalent W+5.67+ sites. In the first W+5.67+ site, W+5.67+ is bonded to four O2- atoms to form WO4 tetrahedra that share corners with eight MgO6 octahedra. The corner-sharing octahedra tilt angles range from 28–64°. There is three shorter (1.81 Å) and one longer (1.84 Å) W–O bond length. In the second W+5.67+ site, W+5.67+ is bonded to five O2- atoms to form distorted WO5 trigonal bipyramids that share corners with five MgO6 octahedra, a cornercorner with one LiO6 pentagonal pyramid, corners with two equivalent WO5 trigonal bipyramids, and edges with two equivalent LiO6 pentagonal pyramids. The corner-sharing octahedra tilt angles range from 28–55°. There are a spread of W–O bond distances ranging from 1.84–2.37 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two equivalent Li1+ and two equivalent W+5.67+ atoms. In the second O2- site, O2- is bonded in a trigonal planar geometry to one Li1+, one Mg2+, and one W+5.67+ atom. In the third O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Mg2+ and one W+5.67+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Mg2+ and one W+5.67+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Mg2+ and one W+5.67+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Mg2+ and one W+5.67+ atom. In the seventh O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Mg2+ and one W+5.67+ atom.