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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on RbBe4(BO3)3 by Materials Project

RbBe4B3O9 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Rb1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Rb–O bond distances ranging from 3.01–3.47 Å. There are two inequivalent Be2+ sites. In the first 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 1.59–1.68 Å. In the second 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. 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 one Rb1+, two Be2+, and one B3+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Rb1+, 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 distorted bent 150 degrees geometry to two equivalent Rb1+, one Be2+, and one B3+ atom. In the fifth O2- site, O2- is bonded in a trigonal planar geometry to one Rb1+, two equivalent Be2+, and one B3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbBe2B3O7 by Materials Project

RbBe2B3O7 crystallizes in the orthorhombic Pmn2_1 space group. The structure is three-dimensional. there are two inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Rb–O bond distances ranging from 2.84–3.28 Å. In the second Rb1+ site, Rb1+ is bonded in a 5-coordinate geometry to twelve O2- atoms. There are a spread of Rb–O bond distances ranging from 2.97–3.48 Å. There are two inequivalent Be2+ sites. In the first 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 1.62–1.69 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 1.58–1.67 Å. There are four 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 1.39 Å. In the second 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 third B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.34 Å) and two longer (1.40 Å) B–O bond length. In the fourth B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.33 Å) and two longer (1.40 Å) B–O bond length. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to one Rb1+, two equivalent Be2+, and one B3+ atom. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two equivalent Rb1+, one Be2+, and one B3+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to one Rb1+ and two equivalent B3+ atoms. In the fourth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Rb1+ and two B3+ atoms. In the fifth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two equivalent Rb1+ and two equivalent B3+ atoms. In the sixth O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent Rb1+, one Be2+, and one B3+ atom. In the seventh O2- site, O2- is bonded in a trigonal planar geometry to one Rb1+, two equivalent Be2+, and one B3+ atom. In the eighth O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Be2+ and one B3+ atom. In the ninth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Rb1+, two equivalent Be2+, and one B3+ atom.

36 MATERIALS SCIENCE↗