Method for preparing bismuth-based high temperature superconductors
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United States of America Patent
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Jul 29, 2003
Grant Date -
Feb 21, 2002
app pub date -
Jul 26, 2001
filing date -
Jul 27, 2000
priority date (Note) -
Expired
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Abstract
The invention provides a method 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 a low cost and efficiently. With the method 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 the stoichiometric ratio of a crystal of the superconductor Bi.sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.z, or (Bi, Pb) .sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.z, 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.
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