Oxide superconductor comprising Cu, Bi, Ca and Sr

Details Oxide superconductor comprising Cu, Bi, Ca and Sr Oxide superconductor comprising Cu, Bi, Ca and Sr

1992-11-13

1994-08-23

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

252518, 252521, 505782, C01F 1102, C01G 302, C01G 2900, H01L 3912

Patent

active

053407962

ABSTRACT:
Novel superconductive oxides are disclosed. The oxides all have layered perovskite-like crystal structure and manifest superconductivity above about 77K. An exemplary material has composition Bi.sub.2.2 Sr.sub.2 Ca.sub.0.8 Cu.sub.2 O.sub.8. Other materials are described by the nominal formula X.sub.2+x M.sub.n-x Cu.sub.n-1 O.sub.2+2n+x/2.+-..delta., where X typically is Bi, or Bi together with Pb or other appropriate substituent, M is one or more divalent ion or mixture of monovalent and trivalent ion, n is an integer greater than 3, x=p/q, where p and q are integers and p<q, and .delta. is less than 0.5. Associated with the inventive compounds typically is a superlattice structure, with T.sub.c of the compound typically being correlated with the superlattice spacing. The inventive compounds are typically relatively ductile.

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