Materials Data on K4Be3O5 by Materials Project
K4Be3O5 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of K–O bond distances ranging from 2.61–3.02 Å. In the second 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 2.69–3.18 Å. There are three inequivalent Be2+ sites. In the first Be2+ site, Be2+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.53 Å) and two longer (1.57 Å) Be–O bond length. In the second Be2+ site, Be2+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.53 Å) and two longer (1.56 Å) Be–O bond length. In the third Be2+ site, Be2+ is bonded in a distorted tetrahedral geometry to four O2- atoms. There is two shorter (1.68 Å) and two longer (1.70 Å) Be–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to five K1+ and two Be2+ atoms. In the second O2- site, O2- is bonded in a linear geometry to four K1+ and two Be2+ atoms. In the third O2- site, O2- is bonded in a 6-coordinate geometry to four K1+ and two Be2+ atoms.