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The thermodynamic parameters of the Nd 2 O 3 –Y 2 O 3  system were re-assessed for better reproduction of experimental data. The thermodynamic parameters were combined from binary descriptions to calculate phase diagrams for the ternary system ZrO 2 –Nd 2 O 3 –Y 2 O 3 . The calculated phase diagrams were used to select compositions for the experimental studies at 1 250, 1400 and 1 600°C. The samples were synthesised by co-precipitation and heat treated at 1 250–1 600 °C, investigated by X-ray diffraction and scanning electron microscopy combined with energy dispersive Xray spectroscopy. It was found that solubility of the Y 2 O 3  in the pyrochlore phase exceeds 10 mol.%. The experimental data obtained for phase equilibra were used to derive thermodynamic parameters for fluorite, Y 2 O 3  cubic phase C, monoclinic B and Nd 2 O 3  hexagonal A phases by CALPHAD method. The isothermal sections and liquidus surface were calculated for the ZrO 2 –Nd 2 O 3 –Y 2 O 3  system.

international journal of materials research

Phase relations in the ZrO 2 –Nd 2 O 3 –Y 2 O 3  system: experimental study and CALPHAD assessment: Paper presented at the 2 nd  Sino-German Symposium on Computational Thermodynamics and Kinetics and their Applications to Solidification