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Preparation of High-Tc Bi-Sr-Ca-Cu-O and Tl-Ba-Ca-Cu-O Superconductors

  • Toshio Usui
  • Nobuyuki Sadakata
  • Yoshimitsu Ikeno
  • Osamu Kohno
  • Hiroshi Osanai
Conference paper

Abstract

Bulk superconductors of the Bi-Sr-Ca-Cu-O and Tl-Ba-Ca-Cu-0 systems have been investigated to clarify their superconducting properties. In the Bi-Sr-Ca-Cu-0 system, its superconducting properties were improved by doping Pb0 after the calcination; the high-Tc phase (105 K) was formed during the sintering process and stabilized down to room temperature. Zero-resistance was realized at 104 K for 5wt% Pb0 doped BiSrCaCu2Ox sintered at 848°C for 72 h in air. In the Tl-Ba-Ca-Cu-O system, its superconducting properties were found to be significantly sensitive to the sintering temperature and the composition of the starting materials. Zero-resistance was achieved at 118 K for Tl2Ba2Ca2Cu3Ox sintered at 880°C for 1 h in O2. In addition, an ac susceptibility result also supports its superconductivity with high critical temperature.

Keywords

Sinter Temperature Sinter Process Critical Current Density Initial Composition Superconducting Property 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Japan 1989

Authors and Affiliations

  • Toshio Usui
    • 1
  • Nobuyuki Sadakata
    • 1
  • Yoshimitsu Ikeno
    • 1
  • Osamu Kohno
    • 1
  • Hiroshi Osanai
    • 1
  1. 1.Tokyo LaboratoryFujikura Ltd.Koto-ku, Tokyo, 135Japan

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