Superconductivity in the Tl–Bi–Ca–Ba–Cu–O and Tl–Bi–Ca–Sr–Cu–O Systems

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  • Torii Yasuko
    Basic High-Technology Laboratories, Sumitomo Electric Industries, Ltd.
  • Kotani Toshihiro
    Basic High-Technology Laboratories, Sumitomo Electric Industries, Ltd.
  • Takei Hiromi
    Basic High-Technology Laboratories, Sumitomo Electric Industries, Ltd.
  • Tada Kouji
    Basic High-Technology Laboratories, Sumitomo Electric Industries, Ltd.

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Description

The influence of the substitution of Bi for Tl in forming the superconducting phases in Tl–Bi–Ca–Ba–Cu–O and Tl–Bi–Ca–Sr–Cu–O systems was investigated. In the Tl–Bi–Ca–Ba–Cu–O system, the Tl Ca2Ba2Cu3O9 phase forms from a 10% to 40% substitution of Bi for Tl in the nominal composition. With a further increaseing Bi, the superconducting phase disappears because of the formation of BaBiO3. On the other hand, the superconducting phase of (Tl, Bi)CaSr2Cu2O7 forms from a 10% to 90% substitution of Bi for Tl in the Tl–Bi–Ca–Sr–Cu–O system. It is recognized that the substitution of Bi for Tl stabilizes and accelerates the formation of the (Tl, Bi)CaSr2Cu2Ox phase.

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