Production of a superconductor powder having a narrow melting transition width using a controlled oxygen atmosphere
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United States of America Patent
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Sep 22, 1992
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N/A
app pub date -
Apr 9, 1991
filing date -
Apr 9, 1991
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Expired
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Abstract
A process for preparing a superconductor-coated substrate including calcining a mixture of powdered yttrium or rare earth oxide (R), barium carbonate and copper oxide in a controlled atmosphere and in accordance with a predetermined temperature profile to form a superconductor powder having a stoichiometric ratio of R-Ba-Cu of approximately 1-2-3. The melting transition width of the resulting powder is relatively narrow, such that the melting onset temperature is above the high temperatures advantageously used to sinter the powder on the substrate.
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