Materials Data on Rb2CoO3 by Materials Project

Abstract

Rb2CoO3 crystallizes in the orthorhombic Cmc2_1 space group. The structure is three-dimensional. Rb1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Rb–O bond distances ranging from 2.87–3.32 Å. Co4+ is bonded to five O2- atoms to form distorted edge-sharing CoO5 trigonal bipyramids. There is one shorter (1.80 Å) and four longer (1.90 Å) Co–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to four equivalent Rb1+ and two equivalent Co4+ atoms. In the second O2- site, O2- is bonded in a distorted single-bond geometry to six equivalent Rb1+ and one Co4+ atom.