Materials Data on K2HfF6 by Materials Project

Abstract

K2HfF6 crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. K1+ is bonded in a 9-coordinate geometry to nine F1- atoms. There are three shorter (2.64 Å) and six longer (2.83 Å) K–F bond lengths. Hf4+ is bonded in a 9-coordinate geometry to nine F1- atoms. There are three shorter (2.07 Å) and six longer (2.25 Å) Hf–F bond lengths. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded to two equivalent K1+ and two equivalent Hf4+ atoms to form a mixture of distorted edge and corner-sharing FK2Hf2 tetrahedra. In the second F1- site, F1- is bonded in a distorted single-bond geometry to four equivalent K1+ and one Hf4+ atom.