Superconducting and microstructural properties of shock-compacted high-T sub c oxide powders
- California Univ., San Diego, La Jolla, CA (USA)
Shock compacted specimens of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} and HoBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} high-T{sub c} oxide powder mixed with 30% (vol) Ag powder have been prepared using the LLNL two-stage light-gas gun in the 30--200 kbar range. We report the experimental technique and results of an investigation of the microstructural and superconducting properties of these composite specimens. Measurements of magnetic susceptibility show that bulk superconductivity is retained in this pressure range with T{sub c} onsets unchanged at 91 K. Oxide particle size is reduced with increasing shock pressure. Complete resistive transitions are observed at T{sub c} = 90 K only after subsequent heat treatment in oxygen. A transport critical current density of 320 A/cm{sup 2} at 77 K in zero field was measured for a specimen shocked to 167 kbar, suggesting that the shock process might introduce defects which serve to pin magnetic flux vortices and thereby increase J{sub c}. 9 refs., 4 figs.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5658035
- Report Number(s):
- UCRL-101901; CONF-890812-57; ON: DE90000823
- Resource Relation:
- Conference: American Physical Society topical conference on shock compression of condensed matter, Albuquerque, NM (USA), 14-17 Aug 1989
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BARIUM OXIDES
SUPERCONDUCTIVITY
COMPRESSION
SHOCK WAVES
COPPER OXIDES
HOLMIUM OXIDES
YTTRIUM OXIDES
HEAT TREATMENTS
MAGNETIC SUSCEPTIBILITY
MICROSTRUCTURE
POWDERS
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HOLMIUM COMPOUNDS
MAGNETIC PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies