Shock-induced defects and flux pinning in YBa sub 2 Cu sub 3 O sub 7-. delta. + Ag composites

Conference · Tue Aug 01 04:00:00 EDT 1989

OSTI ID:5733177

Weir, S. T.; Nellis, W. J.; Kramer, M. J.; Seaman, C. L.; Early, E. A.; Maple, M. B. ^[1]

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1. Lawrence Livermore National Lab., CA (USA)

A composite specimen of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} and silver was fabricated by shock-compacting to 167 kbar a mixture of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} powder and 30% volume silver powder. The recovered sample was then studied with TEM, and the amount of magnetic flux pinning exhibited by the YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} component was determined with a SQUID magnetometer. We find that the shock process resulted in a large increase in the flux pinning energy of the sample. This result is significant because higher pinning energies imply higher intragranular critical currents. 8 refs., 2 figs., 1 tab.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• Sponsoring Organization: DOD; DOE/DP
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5733177
• Report Number(s): UCRL-101904; CONF-890812--58; ON: DE90000827
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COMPACTING
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENTS
DEFECTS
ELECTRIC CURRENTS
ELECTRON MICROSCOPY
ELECTRONIC EQUIPMENT
ELEMENTS
EQUIPMENT
FLUXMETERS
MAGNETIC FLUX
MEASURING INSTRUMENTS
METALS
MICROSCOPY
MICROWAVE EQUIPMENT
OXIDES
OXYGEN COMPOUNDS
SILVER
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES