Increase in the flux-pinning energy of YBa sub 2 Cu sub 3 O sub 7 minus. delta. by shock compaction

Journal Article · Mon May 14 04:00:00 EDT 1990 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.103231· OSTI ID:6973971

Weir, S T; Nellis, W J ^[1]; Kramer, M J ^[2]; Seaman, C L; Early, E A; Maple, M B ^[3]

---

1. Lawrence Livermore National Laboratory, University of California, P. O. Box 808, Livermore, California 94550 (USA)
2. Ames Laboratory, Iowa State Univesity, Ames, Iowa 50011 (USA)
3. University of California, San Diego, La Jolla, California 92093 (USA)

Magnetic flux relaxation data on a composite specimen of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} +Ag shock compacted at 167 kbar show that the flux-pinning energy at 70 K and 10 kOe is enhanced by a factor of 2--3. This enhancement persists after annealing at 890 {degree}C in oxygen for 24 h. The increased pinning energy is apparently caused by shock-induced {l angle}100{r angle} and {l angle}110{r angle} line defects having a density up to 10{sup 12} cm{sup {minus}2}. Annealing replaces line defects with (001) extrinsic stacking faults having displacement vectors of 1/6(031). The average separation of the stacking faults in the (001) direction is 0.04 {mu}m, which is comparable to the separation between fluxoids at 10 kOe. These results indicate that intragranular critical current densities can be increased significantly in bulk materials by shock processing. High densities of flux-pinning sites could be induced efficiently in industrial-scale quantities of bulk high {ital T}{sub {ital c}} oxides by explosives.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6973971
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 56:20; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FLUX DENSITY
FRACTURE PROPERTIES
LINE DEFECTS
MAGNETIC FLUX
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SHOCK WAVES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES