The oxygen potentials corresponding to the YBa sub 2 Cu sub 3 O sub 6+x phase in the Y-Ba-Cu-O system

Journal Article · Wed May 01 00:00:00 EDT 1991 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1016/0022-4596(91)90254-F· OSTI ID:7293831

Borowiec, K; Kolbrecka, K ^[1]

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1. Warsaw Univ. of Tech. (Poland)

Phase relations in the vicinity of the YBa{sub 2}Cu{sub 3}O{sub 6+x} in the CuO-rich part of the Y-Ba-Cu-O system were studied by the equilibration and quenching technique. At 950C, the system is characterized by the large number of solid four-phase combinations. The oxygen potential as a function of temperature for two four-phase combinations, i.e., YBa{sub 2}Cu{sub 3}O{sub 6+x} + BaCuO{sub 2} + BaCu{sub 2}O{sub 2} + Y{sub 2}BaCuO{sub 5} and YBa{sub 2}Cu{sub 3}O{sub 6+x} + BaCu{sub 2}O{sub 2} + Y{sub 2}BaCuO{sub 5} + Cu{sub 2}O, were studied by means of solid state EMF measurements. At higher oxygen potentials the pair of YBa{sub 2}Cu{sub 3}O{sub 6+x} and Y{sub 2}BaCuO{sub 5} is stable in contact with BaCuO{sub 2}. At lower oxygen pressures this pair coexists in equilibrium with BaCu{sub 2}O{sub 2} or Cu{sub 2}O.

• OSTI ID: 7293831
• Journal Information: Journal of Solid State Chemistry; (United States), Vol. 92:1; ISSN 0022-4596
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
37 INORGANIC
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PHYSICAL AND ANALYTICAL CHEMISTRY
BARIUM OXIDES
ELECTRIC POTENTIAL
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COPPER OXIDES
YTTRIUM OXIDES
CHEMICAL REACTIONS
EXPERIMENTAL DATA
FREE ENTHALPY
LOW PRESSURE
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NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
TEMPERATURE RANGE
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