Thermodynamic evaluation for the Y sub 2 O sub 3 -BaO-CuO sub x system

Journal Article · Mon Dec 31 23:00:00 EST 1990 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1991.tb07300.x· OSTI ID:5643097

Lee, B J; Lee, D N ^[1]

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1. Dept. of Metallurigical Engineering, Center for Advanced Materials Research, Seoul National Univ., Seoul 151-742 (KR)

This paper reports on the thermodynamic data for the Y{sub 2}O{sub 3}-BaO-Cu{sub 2}O-CuO quaternary system 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 YBa{sub 2}Cu{sub 3}O{sub 6+{delta}} superconducting compound. The optimized thermodynamic data were used to calculate the phase diagrams of the Cu{sub 2}O-CuO binary system and the CuO{sub {ital x}}-Y{sub 2}Cu{sub 2}O{sub 5} and CuO{sub {ital x}}-BaCuO{sub 2} quasi-binary systems. The results were in good agreement with reported measured data. The liquidus projection and isothermal and vertical sections of the Y{sub 2}O{sub 3}-BaO-CuO{sub {ital x}} 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 + {delta}) in YBA{sub 2}Cu{sub 3}O{sub 6+{delta}} were calculated at various temperatures and oxygen pressures. The results were compared with experimental data.

• OSTI ID: 5643097
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 74:1; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

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