Oriented grained Y-Ba-Cu-O superconductors having high critical currents and method for producing same
Patent
·
OSTI ID:6340093
This patent describes a process for preparing a superconducting metal oxide complex. It comprises: mixing solid compounds containing Y, Ba, Cu and O in amounts appropriate to yield the formula Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 6} + {delta} wherein {delta} has a number value of from about 0.1 to about 1.0; heating the solid compounds in air to a temperature between about 920{degrees} C. to about 960{degrees} C. for a time sufficient to react the compounds in the solid state quenching the solid state reaction product to ambient temperature in air; compacting the mixture into a solid mass; sintering the solid mass; heating the solid mass; rapidly cooling the mass to a temperature between about 1,020 {degrees} to about 1,040{degrees} C. and then cooling the mass to a steady temperature between about 20{degrees} C. to 40{degrees} C. below its melting point at a rate of approximately 1{degrees} C./hour; maintaining the mass at the steady temperature for a time sufficient for the entire mass to resolidify; cooling the resolidified mass in air from the steady temperature to approximately 550{degrees} C. to 650{degrees} C. at the rate of approximately 60{degrees} C. per hour; additionally cooling the resolidified mass to about 380{degrees} C. to about 420{degrees} C. at the rate of approximately 30{degrees} C. per hour in air; and annealing the resolidified mass.
- Assignee:
- Univ. of Houston, University Park, Houston, TX (USA)
- Patent Number(s):
- US 4956336; A
- Application Number:
- PPN: US s 7-309382
- OSTI ID:
- 6340093
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES