Transport critical current density and microstructure in extruded YBa sub 2 Cu sub 3 O sub 7 minus x wires processed by zone melting

Journal Article · Sun Jul 01 04:00:00 EDT 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347122· OSTI ID:6974174

Shi, D; Krishnan, H; Hong, J M; Miller, D ^[1]; McGinn, P J; Chen, W H ^[2]; Xu, M ^[3]; Chen, J G ^[4]; Fang, M M ^[5]; Welp, U ^[6]

---

1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (USA)
2. Materials Science and Engineering Department, University of Notre Dame, Notre Dame, Indiana 46556 (USA)
3. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (USA) Georgia Institute of Technology, School of Physics, Atlanta, Georgia 30322 (USA)
4. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (USA) Department of Materials Science and Engineering, University of Illinois-Urbana, Urbana, Illinois 61801 (USA)
5. Department of Physics, Western Illinois University, Macomb, Illinois 61455 (USA) Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439 (USA)
6. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (USA) Science and Technology Center

YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} compounds were extruded into long wires with the diameter of 1 mm after sintering. The sintered wires were subsequently zone melted to develop a highly textured microstructure. Magnetization experiments at 77 K indicated a {ital J}{sub {ital c}} value of 1{times}10{sup 5} A/cm{sup 2} at 1 T. Transport measurements at 77 K showed a greatly enhanced field dependence of the critical current density. Transmission electron microscopy revealed an important grain-boundary feature which eliminated the weak-link behavior. Large amounts of dislocations have also been found in the zone-melted sample which may contribute to flux pinning in the system.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6974174
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 68:1; ISSN 0021-8979; ISSN JAPIA
• 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
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CURRENTS
DISLOCATIONS
ELECTRIC CURRENTS
ELECTRON MICROSCOPY
FABRICATION
GRAIN BOUNDARIES
HIGH-TC SUPERCONDUCTORS
LINE DEFECTS
LOW TEMPERATURE
MAGNETIZATION
MELTING
MICROSCOPY
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SINTERING
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
WIRES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZONE MELTING