Materials Data on Ba2B5BrO9 by Materials Project

Abstract

Ba2B5O9Br crystallizes in the orthorhombic Pnn2 space group. The structure is three-dimensional. there are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to six O2- and two Br1- atoms. There are a spread of Ba–O bond distances ranging from 2.63–2.97 Å. There are one shorter (3.10 Å) and one longer (3.18 Å) Ba–Br bond lengths. In the second Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to seven O2- and two Br1- atoms. There are a spread of Ba–O bond distances ranging from 2.67–3.33 Å. There are one shorter (3.15 Å) and one longer (3.17 Å) Ba–Br bond lengths. There are five inequivalent B3+ sites. In the first B3+ site, B3+ is bonded to four O2- atoms to form corner-sharing BO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.49–1.51 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 1.37–1.40 Å. In the third B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.38 Å) and one longer (1.39 Å) B–O bond length. In the fourth B3+ site, B3+ is bonded to four O2- atoms to form corner-sharing BO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.47–1.51 Å. In the fifth B3+ site, B3+ is bonded to four O2- atoms to form corner-sharing BO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.46–1.54 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ba2+ and two B3+ atoms. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Ba2+ and two B3+ atoms. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Ba2+ and two B3+ atoms. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ba2+ and two B3+ atoms. In the fifth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two Ba2+ and two B3+ atoms. In the sixth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ba2+ and two B3+ atoms. In the seventh O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two Ba2+ and two B3+ atoms. In the eighth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ba2+ and two B3+ atoms. In the ninth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two Ba2+ and two B3+ atoms. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 4-coordinate geometry to four Ba2+ atoms. In the second Br1- site, Br1- is bonded in a rectangular see-saw-like geometry to four Ba2+ atoms.