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An investigation of phase stability in the Y2O3-Al2O3 system

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Abstract

The stability of the three known phases in the Y2O3-Al2O3 pseudo-binary system has been investigated. YAlO3 (YAP) and Y4Al2O9 (YAM) decompose at elevated temperatures, the products of the reaction being the third compound Y3Al5O12 (YAG) and an unknown phase (designated X). The decomposition is most evident in powders but can also be initiated on the surface of bulk single crystals. X-ray diffraction studies have been performed in an attempt to identify the structure and composition of the unknown phase. The thermal decomposition has been found to be surface controlled and an optical and scanning electron microscope study of the associated morphological changes in YAlO3 indicates that the reaction involves localized surface melting, probably with the loss of oxygen which effectively moves the composition off the binary join.

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Authors and Affiliations

  1. Department of Physical Metallurgy and Science of Materials, University of Birmingham, UK

    J. S. Abell & I. R. Harris

  2. Royal Radar Establishment, Malvern, Worcs, UK

    B. Cockayne & B. Lent

Authors
  1. J. S. Abell
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  2. I. R. Harris
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  3. B. Cockayne
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  4. B. Lent
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Abell, J.S., Harris, I.R., Cockayne, B. et al. An investigation of phase stability in the Y2O3-Al2O3 system. J Mater Sci 9, 527–537 (1974). https://doi.org/10.1007/BF00551870

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  • DOI: https://doi.org/10.1007/BF00551870

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