Materials Data on K2Cr2AsHO10 by Materials Project

Abstract

K2Cr2AsHO10 crystallizes in the trigonal P3_221 space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of K–O bond distances ranging from 2.81–2.85 Å. In the second K1+ site, K1+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of K–O bond distances ranging from 2.88–3.31 Å. Cr6+ is bonded to four O2- atoms to form CrO4 tetrahedra that share a cornercorner with one AsO4 tetrahedra. There are a spread of Cr–O bond distances ranging from 1.62–1.86 Å. As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with two equivalent CrO4 tetrahedra. There is two shorter (1.70 Å) and two longer (1.75 Å) As–O bond length. H1+ is bonded in a linear geometry to two equivalent O2- atoms. Both H–O bond lengths are 1.21 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one K1+, one Cr6+, and one As5+ atom. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one K1+, one As5+, and one H1+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to two K1+ and one Cr6+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to two K1+ and one Cr6+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to two K1+ and one Cr6+ atom.