Thermodynamic modeling of the ZrO2–YO1.5 system

• Published in: Solid state ionics Vol. 170; no. 3-4; pp. 255 - 274
• Main Authors: CHEN, M, HALLSTEDT, B, GAUCKLER, L
• Format: Journal Article
• Language: English
• Published: 31-05-2004
• ISSN: 0167-2738
• DOI: 10.1016/j.ssi.2004.02.017

In the present work, an optimized set of Gibbs energy functions is proposed for the Y-Zr-O ternary system. We focus on the ZrO2-YO1.5 quasi-binary system, but reoptimizations of the Zr-O and Y-O binary systems are included as well. The parameters for the Y-Zr binary system were taken from a previous assessment. The ZrO2-YO1.5 system was treated as a quasi-binary section of the Y-Zr-O ternary system. The existing experimental data on the ZrO2-YO1.5 system were carefully reviewed. The related parameters were optimized using both thermodynamic data and phase diagram data. A calculated phase diagram of the ZrO2-YO1.5 system is presented. Our optimization agrees well with most experimental data. Two calculated isothermal sections of the Y-Zr-O system at 1500 and 2000 K are also included.