Comparison of Bi-system 2223 and 2212 thick superconducting tapes: Grain alignment, current density, and strain effects

Journal Article · Thu Aug 01 00:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.349523· OSTI ID:5683996

Sekine, H; Schwartz, J; Kuroda, T; Inoue, K; Maeda, H; Numata, K; Yamamoto, H ^[1]

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1. National Research Institute for Metals, Sengen 1-2-1, Tsukuba-shi, Ibaraki-ken, 305, Japan (US)

Bi-Sr-Ca-Cu-O (2212) and Bi-Pb-Sr-Ca-Cu-O (2223) superconductors were fabricated into silver-sheathed tapes by cold rolling and sintering. The resulting samples are compared in terms of microstructural alignment, critical current density, and strain dependence. Although both samples show good grain alignment, that of the 2212 phase is superior due to partial melting during heat treatment. This microstructural superiority is reflected in superior {ital J}{sub {ital c}} as well. The single-filament and multifilament 2212 tapes have {ital J}{sub {ital c}} {gt} 5 {times} 10{sup 4} A/cm{sup 2} and {ital J}{sub {ital c}} {gt} 1.5 {times} 10{sup 4} A/cm{sup 2} at 20 T, respectively. Each material shows a similar dependence of {ital J}{sub {ital c}} upon strain, with the 2223 phase exhibiting slightly more degradation. Furthermore, multifilamentary tapes were less affected by strain than single-filament tapes. A multifilamentary tape at 4.2 K, 0.5 T showed only a weak dependence upon strain, indicating that the strain dependence of the Bi system at low temperature may not be severe.

• OSTI ID: 5683996
• Journal Information: Journal of Applied Physics; (USA), Vol. 70:3; ISSN 0021-8979
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
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SYNTHESIS
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HIGH-TC SUPERCONDUCTORS
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STRONTIUM OXIDES
COLD PRESSING
CRITICAL CURRENT
MICROSTRUCTURE
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SUPERCONDUCTING COILS
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PRESSING
STRONTIUM COMPOUNDS
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