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The thermodynamic data for the Yz03-Ba0-CuzO-Cu0 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 Y B a Z C~3 0 6 + 6 superconducting compound. The optimized thermodynamic data were used to calculate the phase diagrams of the CuzO-CuO binary system and the CuOx-YzCuz05 and Cu0,-BaCu02 quasi-binary systems. The results were in good agreement with reported measured data. The liquidus projection and isothermal and vertical sections of the YZ03-Ba0-Cu0, 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 + 8) in YBazCu306+s were calculated at various temperatures and oxygen pressures. The results were compared with experimental data. [

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