Characterization of Ba sub 2 YCu sub 3 O sub x as a function of oxygen partial pressure Part I: Thermoanalytical measurements
Conference
·
· Advanced Ceramic Materials; (USA)
OSTI ID:5096911
- AT and T Bell Labs., Murray Hill, NJ (USA)
The equilibrium oxygen content, X, in the range 6 < X < 7 is described for the high temperature superconductor Ba{sub 2}YCu{sub 3}O{sub x} as a function of P{sub O{sub 2}} and temperature over the ranges 10{sup {minus}3} < P{sub O{sub 2}} < 1 atm. and 400 < {degree}C < 1000. The results are expressed as a series of isocompositional lines on plots of log P{sub O{sub 2}} versus reciprocal temperature. Enthalpy for the oxidation as derived from the slopes of these lines is found to vary from 24 to 26.5 kcal mol{sup {minus}1} (per oxygen atom). These data are derived from thermogravimetry in flowing 100, 21, 2, 1, and 0.091% O{sub 2} at atmospheric pressure. Other supporting thermoanalytical data, DSC, DTA, and EGA are presented to further help understand the effects of atmosphere in this system. For example, the melting point of Ba{sub 2}YCu{sub 3}O{sub x} as determined from DTA at 20{degree}C min{sup {minus}1} was found to vary from approximately 975{degree}C in N{sub 2} to about 1035{degree}C in O{sub 2}.
- OSTI ID:
- 5096911
- Report Number(s):
- CONF-8704372--
- Conference Information:
- Journal Name: Advanced Ceramic Materials; (USA) Journal Volume: 2:3B
- Country of Publication:
- United States
- Language:
- English
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· Advanced Ceramic Materials; (USA)
·
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Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ATMOSPHERES
BARIUM COMPOUNDS
BARIUM OXIDES
CERAMICS
CHALCOGENIDES
CHEMICAL ANALYSIS
CONTROLLED ATMOSPHERES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
ELEMENTS
ENTHALPY
GRAVIMETRIC ANALYSIS
MELTING POINTS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
QUANTITY RATIO
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ATMOSPHERES
BARIUM COMPOUNDS
BARIUM OXIDES
CERAMICS
CHALCOGENIDES
CHEMICAL ANALYSIS
CONTROLLED ATMOSPHERES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
ELEMENTS
ENTHALPY
GRAVIMETRIC ANALYSIS
MELTING POINTS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
QUANTITY RATIO
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES