Production of superconductor materials
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United States of America Patent
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Dec 10, 1991
Grant Date -
N/A
app pub date -
Sep 19, 1988
filing date -
Sep 18, 1987
priority date (Note) -
Expired
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Abstract
Finely divided, homogeneous and easily sintered superconducting powders of at least one rare earth element, e.g., yttrium and/or lanthanum, at least one alkaline earth metal, e.g., barium, calcium and/or strontium, and at least one transition metal, e.g., copper, nickel, manganese, cobalt and/or iron, and oxygen, are produced by (a) intimately admixing a sol of a rare earth element and an aqueous solution of at least one alkaline earth metal nitrate and of at least one nitrate of a transition metal, with the pH of the resulting mixture being adjusted to a value such that said nitrates remain solubilized therein; (b) drying the resulting mixture; (c) calcining the dried product; and, optionally; (d) grinding the calcined material.
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