Crystal structure of the new barium borate Ba5(BO3)2(B2O5) |
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| Authors: | N G Furmanova B A Maksimov V N Molchanov A E Kokh N G Kononova P P Fedorov |
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| Institution: | (1) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskiĭ pr. 59, Moscow, 119333, Russia;(2) Institute of Mineralogy and Petrography, Siberian Division, Russian Academy of Sciences, Universitetskiĭ pr. 3, Novosibirsk, 630090, Russia;(3) General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russia |
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| Abstract: | The crystal structure of the new barium borate Ba5(BO3)2(B2O5) is established (R = 0.0436). Single crystals were grown by spontaneous crystallization in the BaO-B2O3-Na2O system using the flux method. This compound crystallizes in the orthorhombic system, sp. gr. P212121; the unit-cell parameters are a = 9.590(2) Å, b = 16.659(3) Å, c = 22.919(6) Å, and Z = 12. The structure consists of coordination polyhedra of barium cations and the anionic groups BO3] (planar triangles) and B2O5] (vertex-sharing double BO3] triangles), which form a pseudohexagonal framework. Melting of barium borate occurs by a peritectic reaction at 1170 ± 10°C. |
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