Materials Data on KNbWO6 by Materials Project

Abstract

KNbWO6 crystallizes in the orthorhombic Ima2 space group. The structure is three-dimensional. K1+ is bonded in a hexagonal planar geometry to six O2- atoms. There are a spread of K–O bond distances ranging from 2.70–2.82 Å. Nb5+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with two equivalent NbO6 octahedra and corners with four equivalent WO6 octahedra. The corner-sharing octahedra tilt angles range from 37–40°. There are four shorter (2.00 Å) and two longer (2.02 Å) Nb–O bond lengths. W6+ is bonded to six O2- atoms to form WO6 octahedra that share corners with two equivalent WO6 octahedra and corners with four equivalent NbO6 octahedra. The corner-sharing octahedra tilt angles range from 35–38°. There are a spread of W–O bond distances ranging from 1.94–1.97 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent K1+ and two equivalent Nb5+ atoms. In the second O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent W6+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Nb5+, and one W6+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to one K1+, one Nb5+, and one W6+ atom.