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AssigneesSuperconductivity Research Laboratory, International Superconductivity Technology Center
InventorsSergey Lee, Setsuko Tajima
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The invention provides means for stably preparing a bismuth-based high temperature superconductor of a Bi-2223 single-phase or a Bi/Pb-2223 single phase, wherein a second phase is not allowed to reside, at low cost and efficiently. With the means described above, mixed powders of raw materials (mixed powders of oxides and carbonates), obtained by mixing the raw materials such that a mixing ratio of constituents, Bi:Sr:Ca:Cu or (Bi, Pb):Sr:Ca:Cu, becomes identical to a stoichiometric ratio of a crystal of the superconductor Bi2Sr2Ca2Cu3Oz, or (Bi, Pb)2Sr2Ca2Cu3Oz, respectively, are used as raw material for sintering, and the sintering is applied thereto, using KCl as a flux. In this case, the raw material for the sintering as calcinated is preferably used, and the sintering is preferably applied at a sintering temperature kept at a constant level.
A method of preparing a bismuth-based high temperature superconductor of chemical composition represented by (Bi, Pb)2 Sr2Ca2Cu3Oz, wherein mixed powders of raw materials, obtained by mixing the raw materials such that a mixing ratio of constituents, (Bi, Pb):Sr:Ca:Cu, becomes identical to a stoichiometric ratio of a crystal of the superconductor (Bi, Pb)2 Sr2Ca2Cu3Oz, is used as raw material for sintering, and is sintered using KCl as a flux.
A method of preparing a bismuth-based high temperature superconductor of chemical composition represented by Bi2Sr2Ca2Cu3Oz, not containing Pb, wherein mixed powders of raw materials, obtained by mixing the raw materials such that a mixing ratio of constituents, Bi:Sr:Ca:Cu, becomes identical to a stoichiometric ratio of a crystal of the superconductor Bi2 Sr2Ca2Cu3Oz, is used as raw material for sintering, and is sintered using KCl as a flux.
Dependencies are inferred from the claim text.