Member, American Ceramic Society.
Thermodynamic Analysis of the Cubic–Tetragonal Phase Equilibria in the System ZrO2–YO1.5
Article first published online: 21 JAN 2005
Journal of the American Ceramic Society
Volume 80, Issue 10, pages 2685–2688, October 1997
How to Cite
Katamura, J. and Sakuma, T. (1997), Thermodynamic Analysis of the Cubic–Tetragonal Phase Equilibria in the System ZrO2–YO1.5. Journal of the American Ceramic Society, 80: 2685–2688. doi: 10.1111/j.1151-2916.1997.tb03173.x
L.-Q. Chen—contributing editor
Supported by the Grant-in-Aid Ippan Kenkyu(B) 04453055 for Fundamental Scientific Research and the Grant-in-Aid for Scientific Research on the Priority Area 09242206 from the Ministry of Education, Science and Culture, Japan.
- Issue published online: 21 JAN 2005
- Article first published online: 21 JAN 2005
- Manuscript No. 191102. Received April 7, 1997; approved July 18, 1997.
The cubic-tetragonal (c-t) phase equilibria in the system ZrO2-YO1.5 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-ZrO2 with YO1.5 content is slightly different from that in the c/a axial ratio estimated from X-ray diffraction analysis. The displacement of cations and anions may not take place simultaneously during the c-t transformation.