Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Heating – annealing – or sintering
Patent
1993-05-27
1994-04-05
Lieberman, Paul
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Heating, annealing, or sintering
423593, 505725, 505742, 505782, 505510, 505121, C01F 1102, C01F 302, C01F 2900, H01L 3912
Patent
active
053004868
ABSTRACT:
A process and a precursor composition for preparing a lead-doped bismuth-strontium-calcium-copper oxide superconductor of the formula Bi.sub.a Pb.sub.b Sr.sub.c Ca.sub.d Cu.sub.e O.sub.f wherein a is from about 1.7 to about 1.9, b is from about 0.3 to about 0.45, c is from about 1.6 to about 2.2, d is from about 1.6 to about 2.2, e is from about 2.97 to about 3.2 and f is 10.+-.z by reacting a mixture of Bi.sub.4 Sr.sub.3 Ca.sub.3 Cu.sub.4 O.sub.16.+-.z, an alkaline earth metal cuprate, e.g., Sr.sub.9 Ca.sub.5 Cu.sub.24 O.sub.41, and an alkaline earth metal plumbate, e.g., Ca.sub.2-x Sr.sub.x PbO.sub.4 wherein x is about 0.5, is disclosed.
REFERENCES:
patent: 5026680 (1991-06-01), Sugihara
patent: 5049541 (1991-09-01), Uzumaki
patent: 5057488 (1991-10-01), Arendt
patent: 5236889 (1993-08-01), Sugihara
Shiloh "Formation of (Ca.sub.1-x Sr.sub.x).sub.2 PbO.sub.4 in Bi(Pb)-Sr-Ca-Cu-O . . . " J. Appl. Phys. v. 68(5) Sep. 1, 1990, pp. 2304-2307.
Marshall "Two-dimensional superstructure in the (001) plane of Bi.sub.2 [Ca,Sr].sub.3 Cu.sub.2 O.sub.8+y thin films", Appl. Phys. Lett. v. 53(5) Aug. 1, 1988, pp. 426-428.
Hults William L.
Kubat-Martin Kimberly A.
Peterson Dean E.
Phillips David S.
Salazar Kenneth V.
Boyd John
Cottrell Bruce H.
Gaetgens Paul D.
Lieberman Paul
Moser William R.
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