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Phase separation, crystallization and polyamorphism in the Y(2)O(3)-Al(2)O(3) system.

Lawrie B Skinner1, Adrian C Barnes, Philip S Salmon

  • 1H H Wills Physics Laboratory, Royal Fort, Tyndall Avenue, Bristol BS8 1TL, UK.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 23, 2011
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This study investigated glass formation in the Yttrium Aluminum Oxide system using aerodynamic levitation. Homogeneous glasses formed in specific composition ranges, while others showed crystallization or phase separation.

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Area of Science:

  • Materials Science
  • Glass Science
  • Ceramics

Background:

  • Understanding glass formation is crucial for developing new materials.
  • The Yttrium Aluminum Oxide system offers potential for advanced ceramic applications.
  • Aerodynamic levitation enables high-temperature studies of materials without container contamination.

Purpose of the Study:

  • To determine the glass formation range in the (Y2O3)x(Al2O3)1-x system.
  • To characterize the phase behavior and crystallization of levitated oxide liquids.
  • To investigate the relationship between composition and glass structure.

Main Methods:

  • Aerodynamic levitation of oxide liquids.
  • Pyrometric temperature measurements.
  • Optical imaging for visual characterization.
  • X-ray diffraction for phase identification.

Main Results:

  • Homogeneous, single-phase glasses were successfully produced for a specific composition range.
  • Yttrium Aluminum Garnet (YAG) crystallization was observed in Y2O3-rich compositions.
  • Phase separation or nano-crystalline inclusions were noted in Y2O3-poor compositions.
  • Distinct crystallization behaviors (slow vs. sharp recalescence) were linked to different crystalline phases.

Conclusions:

  • The composition range for homogeneous glass formation was established.
  • Crystallization pathways and resulting microstructures depend significantly on composition.
  • The study provides insights into liquid-phase separation and nucleation phenomena in oxide systems.