Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1989-05-01
1993-06-08
Dixon, Jr., William R.
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505782, 501123, 252521, H01L 3912
Patent
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.
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High T.sub.c Update (Nota Bene), Jan. 15, 1989.
Capella Steven
Dixon Jr. William R.
Marcantoni Paul
W. R. Grace & Co.,-Conn.
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