Bi(Pb)-Sr-Ca-Cu-O superconducting composite tapes prepared by the powder method using an Ag sheath

Journal Article · Sat Mar 31 23:00:00 EST 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.345331· OSTI ID:6977774

Kumakura, H; Togano, K; Maeda, H ^[1]; Mimura, M ^[2]

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1. National Research Institute for Metals, 1-2-1, Sengen, Tsukuba-City, Ibaraki 305, Japan (JP)
2. Yokohama R D Laboratories, The Furukawa Electric Co., Ltd., 2-4-3 Okano, Nishi-ku, Yokohama 220, (JP)

The Bi-based oxide superconducting tapes containing high-{ital T}{sub {ital c}} ({ital T}{sub {ital c}}=110 K) and low-{ital T}{sub {ital c}}({ital T}{sub {ital c}}=85 K) phases were prepared by the powder metallurgy method using an Ag sheath, and {ital J}{sub {ital c}} was measured at 77 and 4.2 K in magnetic fields up to 30 T. A grain-oriented microstructure with the {ital c} axes perpendicular to the tape surface was obtained for the tapes with a high-{ital T}{sub {ital c}} phase by applying a combination of cold rolling and sintering. {ital J}{sub {ital c}} of the high-{ital T}{sub {ital c}} tape was significantly improved by this grain orientation. However, large anisotropy in {ital J}{sub {ital c}} with respect to the magnetic field direction was observed for these textured tapes. For the low-{ital T}{sub {ital c}} tapes, it was difficult to obtain a grain-oriented microstructure by the cold rolling and sintering process. However, {ital J}{sub {ital c}} at 4.2 K of the nontextured low-{ital T}{sub {ital c}} tape is as high as that of the grain-oriented high-{ital T}{sub {ital c}} tape. Typical {ital J}{sub {ital c}} values at 4.2 K were above 10{sup 4}A/cm{sup 2} at 12 T for both high- and low-{ital T}{sub {ital c}} tapes. {ital J}{sub {ital c}} at 4.2 K of the Bi-based tapes is much less sensitive to the magnetic field than the conventional metallic superconductors, which indicates that the Bi-based oxide is a good candidate for the high-field superconducting magnet.

• OSTI ID: 6977774
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Journal Issue: 7 Vol. 67:7; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
426001 -- Engineering-- Superconducting Devices & Circuits-- (1990-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL STRUCTURE
CURRENTS
ELECTRIC CURRENTS
FABRICATION
GRAIN ORIENTATION
LOW TEMPERATURE
MAGNETIC FIELDS
MAGNETIC STORAGE DEVICES
MAGNETIC TAPES
MEMORY DEVICES
MICROSTRUCTURE
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
POWDERS
SINTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE