Materials Data on Rb2Cr2O5 by Materials Project
Rb2Cr2O5 crystallizes in the orthorhombic Ima2 space group. The structure is three-dimensional. Rb1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Rb–O bond distances ranging from 2.84–3.40 Å. There are two inequivalent Cr4+ sites. In the first Cr4+ site, Cr4+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Cr–O bond lengths are 1.96 Å. In the second Cr4+ site, Cr4+ is bonded to four O2- atoms to form corner-sharing CrO4 tetrahedra. There are a spread of Cr–O bond distances ranging from 1.66–1.82 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to four equivalent Rb1+ and two equivalent Cr4+ atoms. In the second O2- site, O2- is bonded in a distorted single-bond geometry to four equivalent Rb1+ and one Cr4+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Rb1+ and two equivalent Cr4+ atoms.