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On the Coexistence of Chemically Similar Stable and Metastable Phases in the BeO–MgO–Al2O3–SiO2 System

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Abstract

The joint crystallization of the stable phase (a number of solid solutions of chromium-containing beryllian indialite) and metastable phases (crystalline modifications) of the compound with β-quartz structure (Si0.64Al0.28Mg0.21Be0.09)IVO2 ~ Mg1.89Be0.81Al2.52Si5.76O18 admixed with Cr2O3 phases of khmaralite Mg1.21Cr0.01Be0.46Al1.78Si3.38O20 and spinel {(Mg0.95Be0.045Si0.005)IV(Al1.31Cr0.67Mg0.02)VI}O4 is performed using melted chromium–beryllian indialite preliminarily obtained by solid-phase synthesis as a precursor. Simultaneously, the residual X-ray amorphous melt of composition Mg1.83Cr0.01Be1.04Al2.64Si5.57O18 is hardened. Thus, a reconstructive transition from the beryllian indialite melt to a phase with the β-quartz structure is implemented, and the chemical similarity of these compounds is demonstrated. The rate of change in the crystallization isotherm of 2°С/h and increased heat outflow through the highly heat-conducting walls of the Pt–Rh crucible (taper) contribute to this process.

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Authors and Affiliations

  1. Vinogradov Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, Irkutsk, 664033, Russia

    M. A. Mikhailov, S. G. Mamontova, T. V. Demina, O. Yu. Belozerova & L. A. Bogdanova

  2. National Technical University “Kharkiv Polytechnic Institute”, Kharkiv, 61002, Ukraine

    S. Z. Zelentcov

Authors
  1. M. A. Mikhailov
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  2. S. G. Mamontova
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  3. S. Z. Zelentcov
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  4. T. V. Demina
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  5. O. Yu. Belozerova
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  6. L. A. Bogdanova
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Corresponding author

Correspondence to S. G. Mamontova.

Additional information

Original Russian Text © M.A. Mikhailov, S.G. Mamontova, S.Z. Zelentcov, T.V. Demina, O.Yu. Belozerova, L.A. Bogdanova, 2018, published in Poverkhnost’, 2018, No. 8, pp. 24–29.

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Mikhailov, M.A., Mamontova, S.G., Zelentcov, S.Z. et al. On the Coexistence of Chemically Similar Stable and Metastable Phases in the BeO–MgO–Al2O3–SiO2 System. J. Surf. Investig. 12, 756–760 (2018). https://doi.org/10.1134/S1027451018040328

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  • DOI: https://doi.org/10.1134/S1027451018040328

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