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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ba3Er(BO2)9 by Materials Project

ErBa3B9O18 crystallizes in the hexagonal P6_3/m space group. The structure is three-dimensional. there are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.76–3.03 Å. In the second Ba2+ site, Ba2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are three shorter (2.76 Å) and three longer (2.92 Å) Ba–O bond lengths. Er3+ is bonded in an octahedral geometry to six equivalent O2- atoms. All Er–O bond lengths are 2.27 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 is one shorter (1.33 Å) and two longer (1.41 Å) B–O bond length. 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 1.33–1.42 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to three Ba2+ and one B3+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to one Ba2+, one Er3+, and one B3+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to one Ba2+ and two equivalent B3+ atoms. In the fourth O2- site, O2- is bonded in a bent 120 degrees geometry to one Ba2+ and two equivalent B3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba3Er(BO3)3 by Materials Project

Ba3Er(BO3)3 crystallizes in the hexagonal P6_3cm space group. The structure is three-dimensional. there are four inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a distorted q6 geometry to nine O2- atoms. There are six shorter (2.79 Å) and three longer (3.03 Å) Ba–O bond lengths. In the second Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.71–2.95 Å. In the third Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.78–2.94 Å. In the fourth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.77–3.17 Å. There are two inequivalent Er3+ sites. In the first Er3+ site, Er3+ is bonded in an octahedral geometry to six O2- atoms. All Er–O bond lengths are 2.24 Å. In the second Er3+ site, Er3+ is bonded in an octahedral geometry to six O2- atoms. There are three shorter (2.21 Å) and three longer (2.25 Å) Er–O bond lengths. There are three 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. There is two shorter (1.39 Å) and one longer (1.40 Å) B–O bond length. In the third B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. All B–O bond lengths are 1.39 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three Ba2+, one Er3+, and one B3+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to four Ba2+ and one B3+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to three Ba2+, one Er3+, and one B3+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ba2+, one Er3+, and one B3+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ba2+, one Er3+, and one B3+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to four Ba2+ and one B3+ atom.

36 MATERIALS SCIENCE↗