The thermodynamic parameters for the ZrO2-La2O3-Al2O3 system are assessed using phase equilibrium data. The thermodynamic description of the ZrO2-La2O3-Y2O3 system is derived from binary descriptions. The compound energy formalism and two-sublattice ionic liquid model [01Hil] are applied to describe phases in these systems. Thermodynamic parameters for the ZrO2-La2O3 system are assessed taking into account triangulation in the ternary system of ZrO2-La2O3-Al2O3. Phase equilibria between solid phases in the ternary system ZrO2-La2O3-Al2O3 constrain thermodynamic parameters in the binary system ZrO2-La2O3. Ternary interaction parameter is assessed for the liquid phase using experimental data on liquidus surface of [05Lak]. Isothermal sections at 1523, 1923 K, liquidus surface and several vertical sections are calculated and compared with experimental data of [05Lak]. It should be pointed out that the general character of liquidus surface is reproduced in calculations. However, the calculated primary crystallisation field of pyrochlore phase is wider than obtained in experimental study of [05Lak]. This results in several inconsistencies between calculations and experimental data. New experimental determination of thermodynamic properties of pyrochlore is necessary to resolve the present inconsistencies.
The isothermal sections and liquidus surface are calculated for the ZrO2-La2O3-Y2O3 system. Experimental data are very scarce for this system. The calculated diagrams are useful for planning new experiments in this system.
[01Hil] M. Hillert: J. Alloys Comp. 320 (2001) 161-176.
[05Lak] S. Lakiza, L.M. Lopato: J. Eur. Ceram. Soc. 25 (2005) 1373-1380.

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