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Title: 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

Abstract

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,more » 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.« less

Authors:
;
Publication Date:
Research Org.:
Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, 466 Japan
OSTI Identifier:
6749243
Resource Type:
Journal Article
Journal Name:
J. Mat. Res.; (United States)
Additional Journal Information:
Journal Volume: 3:6
Country of Publication:
United States
Language:
English
Subject:
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; 360204* - Ceramics, Cermets, & Refractories- Physical Properties; 360201 - Ceramics, Cermets, & Refractories- Preparation & Fabrication; 656100 - Condensed Matter Physics- Superconductivity

Citation Formats

Goto, T, and Kada, M. 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. United States: N. p., 1988. Web.
Goto, T, & Kada, M. 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. United States.
Goto, T, and Kada, M. 1988. "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". United States.
@article{osti_6749243,
title = {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},
author = {Goto, T and Kada, M},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/6749243}, journal = {J. Mat. Res.; (United States)},
number = ,
volume = 3:6,
place = {United States},
year = {Tue Nov 01 00:00:00 EST 1988},
month = {Tue Nov 01 00:00:00 EST 1988}
}