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

  • M. A. Mikhailov
  • S. G. Mamontova
  • S. Z. Zelentcov
  • T. V. Demina
  • O. Yu. Belozerova
  • L. A. Bogdanova
Article
  • 11 Downloads

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.

Keywords

beryllian indialite phase with β-quartz structure khmaralite spinel silicate melt phase portrait metastable phases X-ray amorphous phases sol–gel precursor 

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • M. A. Mikhailov
    • 1
  • S. G. Mamontova
    • 1
  • S. Z. Zelentcov
    • 2
  • T. V. Demina
    • 1
  • O. Yu. Belozerova
    • 1
  • L. A. Bogdanova
    • 1
  1. 1.Vinogradov Institute of Geochemistry, Siberian BranchRussian Academy of SciencesIrkutskRussia
  2. 2.National Technical University “Kharkiv Polytechnic Institute”KharkivUkraine

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