Materials Data on Ge2WO6 by Materials Project
WGe2O6 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. W4+ is bonded to six O2- atoms to form WO6 octahedra that share corners with six GeO4 tetrahedra and edges with two equivalent WO6 octahedra. There are a spread of W–O bond distances ranging from 1.99–2.20 Å. There are two inequivalent Ge4+ sites. In the first Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with three equivalent WO6 octahedra and corners with two equivalent GeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 43–58°. There are a spread of Ge–O bond distances ranging from 1.73–1.84 Å. In the second Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with three equivalent WO6 octahedra and corners with two equivalent GeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 35–60°. There are a spread of Ge–O bond distances ranging from 1.74–1.81 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent W4+ and one Ge4+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ge4+ atoms. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two equivalent Ge4+ atoms. In the fourth O2- site, O2- is bonded in a bent 150 degrees geometry to one W4+ and one Ge4+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one W4+ and one Ge4+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent W4+ and one Ge4+ atom.