Thermodynamic assessment of the systems La₂O₃–Al₂O₃ and La₂O₃–Y₂O₃

Abstract

Abstract The thermodynamic parameters of the systems La 2 O 3 –Al 2 O 3 and La 2 O 3 –Y 2 O 3 are assessed using the Calphad technique. The available phase equilibrium data and calorimetric measurements for the LaAlO 3 , perovskite phase have been used. The calculated phase diagrams are in reasonable agreement with experimental results. However, experimental data for the La 2 O 3 –Y 2 O 3 system demonstrated large uncertainty and new experimental study of solid state reactions would be useful to verify the calculated diagram. Experimental investigations of thermodynamic properties are necessary for both systems to verify the calculated phase diagrams and thermodynamic properties.