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

  • Masahiro Yoshimura
  • Eiji Tani
  • Shigeyuki Sōmiya


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.


Phase Diagram Phase Equilibrium Hydrothermal Treatment Stability Field Ce02 Content 
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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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