Critical current density of Ba/sub 2/Y/sub 1/Cu/sub 3/O/sub 7-//sub x/ superconducting filaments produced by various suspension spinning conditions

Journal Article · Tue Nov 01 00:00:00 EST 1988 · J. Mat. Res.; (United States)

OSTI ID:6749243

Goto, T; Kada, M

The suspension spinning of a Ba/sub 2/Y/sub 1/Cu/sub 3/O/sub x/ superconductor under various conditions was studied to prepare a long filament with high J/sub c/. The oxide powder was suspended in a PVA solution containing a dispersant. The viscous suspension was extruded as a filament into a precipitating medium and coiled on a winding drum. The obtained filament was heated to remove volatile components and to generate the layered perovskite phase. The spinning was examined in an aqueous system and a nonaqueous system. The filament with higher J/sub c/ was obtained for the nonaqueous solution. The J/sub c/ was dependent on the fineness of the starting oxide powder, solvent, precipitating medium, degree of polymerization of PVA, the kind of dispersant used, and the oxide powder contents of the spinning dope, as well as the heating condition. The highest J/sub c/ value obtained by resistivity measurement at 77 K and zero field, 680 A/cm/sup 2/, was attained for the filament spun under optimum spinning conditions. The magnetization curve of the filament showed that the material was a type II superconductor. The hysteresis of thin filaments was relatively small compared with that for the thick filaments. The J/sub c/ at 79 K, estimated from the magnetization curve, was one order of magnitude higher than the J/sub c/ measured by the resistivity method and decreased drastically with increasing field.

• Research Organization: Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, 466 Japan
• OSTI ID: 6749243
• Journal Information: J. Mat. Res.; (United States), Vol. 3:6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
CRITICAL CURRENT
SOLIDIFICATION
COPPER OXIDES
YTTRIUM OXIDES
AQUEOUS SOLUTIONS
EXTRUSION
FILAMENTS
SUPERCONDUCTIVITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CURRENTS
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
FABRICATION
MATERIALS WORKING
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
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Cermets
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360201 - Ceramics
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656100 - Condensed Matter Physics- Superconductivity