Abstract
The thermodynamic parameters are assessed for the HfO 2–Y 2O 3 system based on phase equilibrium data, calorimetric and vapour pressure data. The thermodynamic description for the HfO 2–Al 2O 3 system is derived from phase equilibrium data. The obtained thermodynamic descriptions of binary systems are combined with literature data for the Y 2O 3–Al 2O 3 system and the thermodynamic database for the HfO 2–Y 2O 3–Al 2O 3 system is derived assuming that ternary interaction parameters in all phases are equal to zero. The isothermal sections are calculated in the temperature range 1373–2073 K. The calculated liquidus surface for the HfO 2–Y 2O 3–Al 2O 3 system is similar to the one for the ZrO 2–Y 2O 3–Al 2O 3 system.
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