Materials Data on KGaF4 by Materials Project

Abstract

KGaF4 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 9-coordinate geometry to nine F1- atoms. There are a spread of K–F bond distances ranging from 2.72–3.15 Å. In the second K1+ site, K1+ is bonded in a 7-coordinate geometry to seven F1- atoms. There are a spread of K–F bond distances ranging from 2.67–2.90 Å. Ga3+ is bonded to six F1- atoms to form corner-sharing GaF6 octahedra. The corner-sharing octahedra tilt angles range from 18–31°. There are a spread of Ga–F bond distances ranging from 1.86–1.98 Å. There are five inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one K1+ and two equivalent Ga3+ atoms. In the second F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one K1+ and two equivalent Ga3+ atoms. In the third F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one K1+ and two equivalent Ga3+ atoms. In the fourth F1- site, F1- is bonded to three K1+ and one Ga3+ atom to form a mixture of distorted edge and corner-sharing FK3Ga tetrahedra. In the fifth F1- site, F1- is bonded in a 1-coordinate geometry to three K1+ and one Ga3+ atom.