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Journal of Materials Science

, Volume 29, Issue 7, pp 1873–1878 | Cite as

Synthesis and crystallization of yttrium-aluminium garnet and related compounds

  • N. J. Hess
  • G. D. Maupin
  • L. A. Chick
  • D. S. Sunberg
  • D. E. McCreedy
  • T. R. Armstrong
Papers

Abstract

Amorphous oxide combustion products with compositions corresponding to Y4Al2O9, YAlO3, and Y3Al5O12 were synthesized by the glycine-nitrate process and heat-treated to induce crystallization. The crystalline structure of the resulting powders was determined by powder X-ray diffraction techniques. The phase stabilities of the crystalline phases were investigated as functions of the glycine-to-nitrate ratio, the yttrium-to-aluminium ratio, and the heat-treatment conditions. Heat treatment for short durations resulted in incompletely crystalline powders that consisted of a mixture of Y4Al2O9, YAlO3, and Y3Al5O12 phases, regardless of the chemical composition of the amorphous combustion product. However, heat treatment for longer durations or higher temperature generated both pure-phase, monoclinic Y4Al2O9 and Y3Al5O12 with the garnet structure. Prolonged heat treatment at high temperature failed to generate pure-phase orthorhombic YAlO3. Subsequent analysis revealed a sluggish, complex crystallization process involving the formation and decomposition of several phases.

Keywords

Crystallization Heat Treatment Phase Stability Combustion Product Crystalline Powder 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • N. J. Hess
    • 1
  • G. D. Maupin
    • 1
  • L. A. Chick
    • 1
  • D. S. Sunberg
    • 1
  • D. E. McCreedy
    • 1
  • T. R. Armstrong
    • 1
  1. 1.Pacific Northwest LaboratoryRichlandUSA

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