DOI: 10.17188/1655478
title: Materials Data on KNb13O33 by Materials Project

description: KNb13O33 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. K1+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All K–O bond lengths are 2.65 Å. There are seven inequivalent Nb5+ sites. In the first Nb5+ site, Nb5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Nb–O bond distances ranging from 1.80–2.38 Å. In the second Nb5+ site, Nb5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Nb–O bond distances ranging from 1.81–2.42 Å. In the third Nb5+ site, Nb5+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 2–32°. There are a spread of Nb–O bond distances ranging from 1.85–2.29 Å. In the fourth Nb5+ site, Nb5+ is bonded to six O2- atoms to form distorted corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 2–15°. There are a spread of Nb–O bond distances ranging from 1.87–2.24 Å. In the fifth Nb5+ site, Nb5+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 3–33°. There are a spread of Nb–O bond distances ranging from 1.84–2.29 Å. In the sixth Nb5+ site, Nb5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Nb–O bond distances ranging from 1.80–2.46 Å. In the seventh Nb5+ site, Nb5+ is bonded to six O2- atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 0–2°. There are a spread of Nb–O bond distances ranging from 1.94–2.04 Å. There are seventeen inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to two Nb5+ atoms. In the second O2- site, O2- is bonded in a linear geometry to two equivalent Nb5+ atoms. In the third O2- site, O2- is bonded in a distorted linear geometry to two Nb5+ atoms. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to three Nb5+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to three Nb5+ atoms. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to three Nb5+ atoms. In the seventh O2- site, O2- is bonded in a linear geometry to two Nb5+ atoms. In the eighth O2- site, O2- is bonded in a distorted linear geometry to two Nb5+ atoms. In the ninth O2- site, O2- is bonded in a 3-coordinate geometry to three Nb5+ atoms. In the tenth O2- site, O2- is bonded in a linear geometry to two Nb5+ atoms. In the eleventh O2- site, O2- is bonded in a linear geometry to two Nb5+ atoms. In the twelfth O2- site, O2- is bonded to two equivalent K1+ and two Nb5+ atoms to form a mixture of distorted edge and corner-sharing OK2Nb2 tetrahedra. In the thirteenth O2- site, O2- is bonded in a linear geometry to two Nb5+ atoms. In the fourteenth O2- site, O2- is bonded in a linear geometry to two Nb5+ atoms. In the fifteenth O2- site, O2- is bonded in a 4-coordinate geometry to four Nb5+ atoms. In the sixteenth O2- site, O2- is bonded in a linear geometry to two equivalent Nb5+ atoms. In the seventeenth O2- site, O2- is bonded in a linear geometry to two Nb5+ atoms.