Materials Data on SrBeB2O5 by Materials Project
SrBeB2O5 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.50–2.87 Å. Be2+ is bonded to four O2- atoms to form BeO4 tetrahedra that share corners with two equivalent BeO4 tetrahedra and corners with four equivalent BO4 tetrahedra. There are a spread of Be–O bond distances ranging from 1.62–1.67 Å. There are two inequivalent B3+ sites. In the first 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 1.37–1.41 Å. In the second B3+ site, B3+ is bonded to four O2- atoms to form BO4 tetrahedra that share corners with two equivalent BO4 tetrahedra and corners with four equivalent BeO4 tetrahedra. There is one shorter (1.47 Å) and three longer (1.50 Å) B–O bond length. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to four equivalent Sr2+ and one B3+ atom. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two equivalent Sr2+ and two B3+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Sr2+, two equivalent Be2+, and one B3+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two equivalent Sr2+, one Be2+, and one B3+ atom. In the fifth O2- site, O2- is bonded in a trigonal planar geometry to one Be2+ and two equivalent B3+ atoms.