Improvement in critical current density of Bi sub 2 Sr sub 2 Ca sub 1 Cu sub 2 O sub x tapes synthesized by doctor-blade casting and melt growth

Journal Article · Mon Mar 05 04:00:00 EST 1990 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.102595· OSTI ID:6861608

Kase, J; Irisawa, N; Morimoto, T ^[1]; Togano, K; Kumakura, H; Dietderich, D R; Maeda, H ^[2]

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1. Asahi Glass Research Center, Asahi Glass Co., Ltd., Hazawa-cho, Kanagawa-ku, Yokohama 221, Japan (JP)
2. National Research Institute for Metals, 1-2-1, Sengen, Tsukuba, Ibaraki 305, Japan (JP)

Bi{sub 2}Sr{sub 2}Ca{sub 1}Cu{sub 2}O{sub {ital x}} superconducting tape with an excellent {ital J}{sub {ital c}} at 4.2 K has been synthesized by a modified doctor-blade process. A green tape prepared by doctor-blade casting is laid on a silver foil and heat treated at various temperatures below and above its partial melting temperature. The {ital J}{sub {ital c}} of the tape increases dramatically when heat treated in a narrow temperature range just above the melting temperature. A highly oriented layer structure with {ital c}-axis alignment is obtained by the growth of aligned Bi{sub 2}Sr{sub 2}Ca{sub 1}Cu{sub 2}O{sub {ital x}} grains in the partially melted state. This oriented microstructure produces an exceptional increase in {ital J}{sub {ital c}} . Typical {ital J}{sub {ital c}}'s of the tape at 4.2 K are 50 000 A/cm{sup 2} at 0 T, 22 000 A/cm{sup 2} at 10 T, and 17 000 A/cm{sup 2} at 23 T. Note the small magnetic field dependence in {ital J}{sub {ital c}} above 10 T.

• OSTI ID: 6861608
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 56:10; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
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
CURRENT DENSITY
CURRENTS
DATA
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
FABRICATION
HEAT TREATMENTS
INFORMATION
LAYERS
MAGNETIC FIELDS
MELTING
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TYPE-II SUPERCONDUCTORS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE