Thermodynamic Evaluation for the Y2O3–BaO–CuOx System

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Abstract
The thermodynamic data for the Y2O3–BaO–Cu2O–CuO quaternary system were optimized from measured thermodynamic data. A two‐sublattice model for ionic solution was used to express the Gibbs free energy of the liquid phase, and a two‐sublattice regular solution model was used for the nonstoichiometric YBa2Cu3O6+δ superconducting compound. The optimized thermodynamic data were used to calculate the phase diagrams of the Cu2O–CuO binary system and the CuOx–Y2Cu2O5 and CuOx–BaCuO2 quasi‐binary systems. The results were in good agreement with reported measured data. The liquidus projection and isothermal and vertical sections of the Y2O3–BaO‐CuOx quasi‐ternary system were calculated. The effect of oxygen pressure on some reaction temperatures was predicted by calculating them at various oxygen pressures, and the oxygen contents (6 +δ) in YBa2Cu3O6+δ were calculated at various temperatures and oxygen pressures. The results were compared with experimental data.

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