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Phase Assemblages in the Melt State in Ag-Sheathed Bi-2212 Tape in 1% and 7.5% O2

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Advances in Superconductivity VI

Abstract

Ag-sheathed Bi-2212 (Bi2Sr2CaCu2Ox) tape has been melt processed in 1% and 7.5% O2 remainder N2 atmospheres. In 7.5% O2 the melt from which 2212 forms on cooling contained liquid, (Sr,Ca)CuO2 (1:1), and (Sr,Ca)2Cu3 (2:1), and in 1% O2 it contained these same phases plus a Cu-free phase tentatively identified as Bi2(Sr,Ca)3Ox. The 2:1 phase appears to be advantageous for develo** a homogeneous, well-aligned microstructure using melt processing, but the large grain size of 1:1 and the Cu-free phase cause severe problems with develo** this desirable microstructure. It is concluded that processing in reduced pO2 (1% and 7.5% O2) is not advantageous for develo** a homogeneous, highly-aligned microstructure by melt processing.

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Author information

Authors and Affiliations

  1. Department of Materials Science and Engineering, and Applied Superconductivity Center, University of Wisconsin-Madison, Madison, WI, 53706, USA

    Eric E. Hellstrom & Wei Zhang

Authors
  1. Eric E. Hellstrom
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  2. Wei Zhang
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Editors and Affiliations

  1. Faculty of Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima, 724, Japan

    Toshizo Fujita

  2. Superconductivity Research Laboratory, ISTEC, Koto-ku, Tokyo, 135, Japan

    Yuh Shiohara

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© 1994 Springer-Verlag Tokyo

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Hellstrom, E.E., Zhang, W. (1994). Phase Assemblages in the Melt State in Ag-Sheathed Bi-2212 Tape in 1% and 7.5% O2 . In: Fujita, T., Shiohara, Y. (eds) Advances in Superconductivity VI. Springer, Tokyo. https://doi.org/10.1007/978-4-431-68266-0_134

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  • DOI: https://doi.org/10.1007/978-4-431-68266-0_134

  • Publisher Name: Springer, Tokyo

  • Print ISBN: 978-4-431-68268-4

  • Online ISBN: 978-4-431-68266-0

  • eBook Packages: Springer Book Archive

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