Tin-containing ceramic composition

Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k

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505782, 501123, 252521, H01L 3912

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active

052179460

ABSTRACT:
Superconductors having a composition Bi.sub.2-a-b-c Sn.sub.a Pb.sub.b Sb.sub.c Sr.sub.2 Ca.sub.n-1 Cu.sub.n O.sub.2n+4 can be made by firing the appropriate mixtures of designated oxides or carbonates. In the composition a=about 0.001-0.4, b about 0-0.4, c about 0-0.4, and n 2 or 3. The addition of Sn improves the superconductive properties of comparable compositions that lack Sn. For example, Bi.sub.1.6 Sn.sub.0.4 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.x (x=ca 10), calcined at 830.degree. C. for 15 hours shows superconductivity by magnetic susceptibility tests at about 77.degree. K. whereas Bi.sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.10 prepared under the same conditions but lacking Sn, shows nothing at this temperature.

REFERENCES:
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"Heat Treatment and Dopant Effects on the Superconductivity of Bi-Sr-Ca-Cu-O Ceramics", A. Maddalena, Journal of Materials Science Letters, (1989), vol. 8, No. 3, pp. 334-336.
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Liu, H. et al., Zero Resistance at 132.degree. K. in the Multiphase System of Bi.sub.1.9-x Pb.sub.x Sb.sub.0.1 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.y with X=0.3, 0.4. (Undated preprint.).
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High T.sub.c Update (Nota Bene), Jan. 15, 1989.

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