High temperature superconductors in the La/sub 1+x/Ba/sub 2-x/Cu/sub 3/O/sub y/ system
Conference
·
OSTI ID:5573694
In the La Ba Cu oxide system the La ions can substitute on the Ba sites due to a close match in the ionic radius of the two (as opposed to the Y Ba Cu oxide system). Thus it is possible to make a solid solution La/sub 1+x/Ba/sub 2-x/Cu/sub 3/O/sub y/ where O approx. x less than or equal to 0.5 and y approx. 7. Several compounds of this family have been made, and their synthesis and crystal structure are described. LaBa/sub 2/Cu/sub 3/O/sub y/ can be made under high pressure O/sub 2/. This phase is orthorhombic: as the La content increases. La substitutes on the Ba sites until for La/sub 1.5/Ba/sub 1.5/Cu/sub 3/O/sub 7.33/, 1/4 of the Ba are replaced by La (disordered). This substitution changes the crystal symmetry from orthorhombic to tetragonal. The transition temperature and the critical current for various members of this series are presented. In particular, it will be shown that the midpoint in this series, La/sub 1.25/Ba/sub 1.75/Cu/sub 3/O/sub y/. Is a tetragonal bulk superconductor. Effect of various heat treatments on the superconducting properties is also presented. 19 refs., 3 figs., 2 tabs.
- Research Organization:
- Du Pont de Nemours (E.I.) and Co., Wilmington, DE (USA). Central Research and Development Dept.; Brookhaven National Lab., Upton, NY (USA); Virginia Univ., Charlottesville (USA). Dept. of Physics
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5573694
- Report Number(s):
- BNL-40757; CONF-871124-85; ON: DE88006367
- Country of Publication:
- United States
- Language:
- English
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OSTI ID:7007100
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CURRENT DENSITY
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITY RATIO
RARE EARTH COMPOUNDS
SOLID SOLUTIONS
SOLUTIONS
SUPERCONDUCTIVITY
TETRAGONAL LATTICES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CURRENT DENSITY
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITY RATIO
RARE EARTH COMPOUNDS
SOLID SOLUTIONS
SOLUTIONS
SUPERCONDUCTIVITY
TETRAGONAL LATTICES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE