The Confirmation of Phase Equilibria in the System ZrO2-CeO2 Below 1400°C

  • Masahiro Yoshimura
  • Eiji Tani
  • Shigeyuki Sōmiya

Abstract

Critical review of the phase diagrams proposed previously suggested incomplete establishment of the phase equilibria in the system ZrO2-CeO2 below 1400°C. Application of hydrothermal techniques enabled us to attain the equilibria in this system. The tetragonal SS (solid solution) was no longer stable below 1000°C, where it decomposed into the stable monoclinic SS and cubic SS. The solubility limit of the tetragonal or cubic SS was 23 wt%(18 mol%) CeO2 or 79 wt%(73mol%) CeO2, respectively at 1400°C. That of the monoclinic or cubic SS was 5 wt%(3.5 moI%) CeO2 or 96 wt%(95mol%) CeO2, respectively at 800°C. Thermochemical calculation appears to make it possible to predict true equilibria in this system.

Keywords

Phase Diagram Phase Equilibrium Hydrothermal Treatment Stability Field Ce02 Content 
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

© Elsevier Science Publishers LTD 1989

Authors and Affiliations

  • Masahiro Yoshimura
    • 1
  • Eiji Tani
    • 1
  • Shigeyuki Sōmiya
    • 1
  1. 1.Laboratory for Hydrothermal Syntheses, Research Laboratory of Engineering Materials, Department of Materials Science and EngineeringTokyo Institute of TechnologyYokohamaJapan

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