Materials Data on KNbWO6 by Materials Project
KNbWO6 crystallizes in the orthorhombic Ima2 space group. The structure is three-dimensional. K1+ is bonded in a 3-coordinate geometry to six O2- atoms. There are a spread of K–O bond distances ranging from 2.94–3.40 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 34–43°. There are a spread of Nb–O bond distances ranging from 1.95–2.09 Å. 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 34–43°. There are a spread of W–O bond distances ranging from 1.89–2.02 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-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 bent 150 degrees 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.