Materials Data on K2CO3 by Materials Project

Abstract

K2CO3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded to six O2- atoms to form face-sharing KO6 octahedra. There are a spread of K–O bond distances ranging from 2.66–2.84 Å. In the second K1+ site, K1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of K–O bond distances ranging from 2.87–3.11 Å. C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.30 Å) and two longer (1.31 Å) C–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 C4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to four K1+ and one C4+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to five K1+ and one C4+ atom.