High-temperature superconductivity. Final report
Technical Report
·
OSTI ID:7248996
After the initial discovery of superconductivity over 30K in the La/sub 2/-XBaXCuO/sub 4/ system several groups confirmed the result both resistively and magnetically (flux expulsion). Ultimately, transitions were observed in the analagous compounds with Ba replaced with Ca7 and Sr7,8 for 0.1 less than or equal to x less than or equal to 0.3 with the highest Tc's above 40K. The author's samples were prepared from reagent-grade powders of La/sub 2/O/sub 3/, BaCO/sub 3/, SrCO/sub 3/, CaCO/sub 3/, PbO/sub 2/, and CuO. The powders were mixed in inappropriate ratios and calcined in air between 1000 and 1100C for 12 hours. The resulting materials were reground, pressed into small disks (nominally 1 cm diameter by 2 mm height) and sintered in air at 1000-1100C for 12h. The calcined powders and sintered pellets were x-rayed following each process to ensure that the proper phase was present.
- Research Organization:
- Naval Research Lab., Washington, DC (USA)
- OSTI ID:
- 7248996
- Report Number(s):
- AD-A-190259/2/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DISPERSIONS
DOCUMENT TYPES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FABRICATION
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PELLETS
PHYSICAL PROPERTIES
POWDERS
PROGRESS REPORT
RARE EARTH COMPOUNDS
SINTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DISPERSIONS
DOCUMENT TYPES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FABRICATION
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PELLETS
PHYSICAL PROPERTIES
POWDERS
PROGRESS REPORT
RARE EARTH COMPOUNDS
SINTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS