Materials Data on CsBe4(BO3)3 by Materials Project
CsBe4(BO3)3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Cs1+ is bonded in a 4-coordinate geometry to four equivalent O2- atoms. There are two shorter (3.11 Å) and two longer (3.14 Å) Cs–O bond lengths. There are two inequivalent Be2+ sites. In the first Be2+ site, Be2+ is bonded to four O2- atoms to form a mixture of corner and edge-sharing BeO4 tetrahedra. There are a spread of Be–O bond distances ranging from 1.61–1.65 Å. In the second Be2+ site, Be2+ is bonded to four O2- atoms to form corner-sharing BeO4 tetrahedra. There are a spread of Be–O bond distances ranging from 1.59–1.69 Å. There are two inequivalent B3+ sites. In the first B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. All B–O bond lengths are 1.38 Å. In the second B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of B–O bond distances ranging from 1.35–1.41 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to two Be2+ and one B3+ atom. In the second O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Be2+ and one B3+ atom. In the third O2- site, O2- is bonded in a trigonal planar geometry to two Be2+ and one B3+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Be2+ and one B3+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Cs1+, one Be2+, and one B3+ atom.