Thermodynamic analysis of the cubic-tetragonal phase equilibria in the system ZrO{sub 2}-YO{sub 1.5}
- Univ. of Tokyo (Japan). Dept. of Materials Science
The cubic-tetragonal (c-t) phase equilibria in the system ZrO{sub 2}-YO{sub 1.5} are thermodynamically analyzed from Landau`s phenomenological theory. The calculated c-t two-phase field is depicted as a miscibility gap with a sharp maximum and the spinodal region as originally predicted by Hillert and Sakuma. However, the observed c-t two-phase field and the spinodal region are better described by the present model. In addition, this model can be used to discuss the nature of the c-t diffusionless transformation from the order parameter in contrast with the original model. The predicted change in the tetragonality of t-ZrO{sub 2} with YO{sub 1.5} content is slightly different from that in the cla axial ratio estimated from X-ray diffraction analysis. The displacement of cations and anions may not take place simultaneously during the c-t transformation.
- OSTI ID:
- 554067
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 10 Vol. 80; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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