Materials Data on Na2BeB2O5 by Materials Project
Na2BeB2O5 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Na1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Na–O bond distances ranging from 2.35–2.96 Å. Be2+ is bonded in a tetrahedral geometry to four O2- atoms. There is two shorter (1.64 Å) and two longer (1.67 Å) Be–O bond length. B3+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of B–O bond distances ranging from 1.36–1.42 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to three equivalent Na1+, one Be2+, and one B3+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to three equivalent Na1+, one Be2+, and one B3+ atom. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two equivalent Na1+ and two equivalent B3+ atoms.