Prediction of the Isothermal Sections in the ZrO2-YO1.5-CeO2 System
Prediction of the Isothermal Sections in the ZrO_2-YO_(1.5)-CeO_2 System

The experimental work on the ZrO2-YO1.5-CeO2 system, its limiting quasi-binaries and previous thermodynamic assessments are reviewed and evaluated. Isothermal sections of ZrO2-YO1.5-CeO2 system in the temperature region between 1450 and 1800 C are estimated according to the substitutional model using the Bonnier equation. The CSS + YSS two-phase region of the calculated isothermal section at 1700 degreesC was found to be in good agreement with the experimentally obtained ternary diagram of Longo and Podda. The phase composition in the ZrO2-rich corner however disagreed significantly.