Materials Data on K3ErF6 by Materials Project

Abstract

K3ErF6 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 8-coordinate geometry to four equivalent F1- atoms. All K–F bond lengths are 2.66 Å. In the second K1+ site, K1+ is bonded in a linear geometry to two equivalent F1- atoms. Both K–F bond lengths are 2.41 Å. Er3+ is bonded in an octahedral geometry to six F1- atoms. All Er–F bond lengths are 2.16 Å. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted trigonal planar geometry to two equivalent K1+ and one Er3+ atom. In the second F1- site, F1- is bonded in a linear geometry to one K1+ and one Er3+ atom.