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Thermal expansion and order-disorder polymorphic transformation in the family of borates BaNaMe(BO3)2, Me = Sc, Y

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Abstract

The thermal behavior of BaNaMe(BO3)2, Me = Sc, Y (space group R-3) is studied by the methods of high-temperature X-ray powder diffraction, differential scanning calorimetry, and thermogravimetry in the range from room temperature to 1300°C. It is shown that a polymorphic transition with a two-fold reduction of the unit cell volume is observed at 775 ± 20°C (Sc) and 375 ± 30°C (Y). New polymorphic modifications are solid solutions (Ba, Na)Me(BO3)2, (Me = Sc, Y) with a disordered distribution of Ba and Na atoms. Eigenvalues of the thermal expansion tensor of the polymorphic modifications are calculated for BaNaSc(BO3)2 and BaNaY(BO3)2. The solid solutions are stable approximately up to 819°C (Sc) and 770°C (Y); at higher temperatures, the solid-state decomposition of these phases begins.

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Authors and Affiliations

  1. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, nab. Makarova 2, St. Petersburg, 199034, Russia

    S. N. Volkov, R. S. Bubnova & V. L. Ugolkov

  2. Faculty of Geology, Saint-Petersburg State University, Universitetskaya nab 7/9, St. Petersburg, 199034, Russia

    S. K. Filatov

  3. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia

    T. N. Svetlyakova & A. E. Kokh

Authors
  1. S. N. Volkov
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  2. S. K. Filatov
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  3. R. S. Bubnova
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  4. V. L. Ugolkov
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  5. T. N. Svetlyakova
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  6. A. E. Kokh
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Correspondence to S. K. Filatov.

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Original Russian Text © S.N. Volkov, S.K. Filatov, R.S. Bubnova, V.L. Ugolkov, T.N. Svetlyakova, A.E. Kokh, 2012, published in Fizika i Khimiya Stekla.

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Volkov, S.N., Filatov, S.K., Bubnova, R.S. et al. Thermal expansion and order-disorder polymorphic transformation in the family of borates BaNaMe(BO3)2, Me = Sc, Y. Glass Phys Chem 38, 162–171 (2012). https://doi.org/10.1134/S108765961201018X

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  • DOI: https://doi.org/10.1134/S108765961201018X

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