Materials Data on K2CrO4 by Materials Project

Abstract

K2CrO4 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 1-coordinate geometry to ten O2- atoms. There are a spread of K–O bond distances ranging from 2.69–3.31 Å. In the second K1+ site, K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.78–3.31 Å. Cr6+ is bonded in a tetrahedral geometry to four O2- atoms. There is one shorter (1.66 Å) and three longer (1.67 Å) Cr–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to five K1+ and one Cr6+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to five K1+ and one Cr6+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to four K1+ and one Cr6+ atom.