Bismuth oxide superconductors, and devices and systems...

Details Bismuth oxide superconductors, and devices and systems... Bismuth oxide superconductors, and devices and systems...

H - Electricity

01

L

31/198

H01L 39/12 (2006.01) C01G 29/00 (2006.01)

Patent

CA 1340229

A new class of Bi-based superconductive oxides is disclosed. As do the previously known Bi-based oxide superconductors, the novel materials have a perovskite-like crystal structure. However, in contradistinction to the prior art materials, the inventive materials have unmixed B-site occupancy, with all substituents occupying A-sites. This tends to produce marginal stability and enhanced transition temperatures, as compared to the prior art Bi-based oxide superconductors. Materials according to the invention have composition ABiO3-.delta., with A being Ba and at least one monovalent element (typically chosen from Na, K, Rb, and Cs) and 0 ~ .delta. ~ 0.1, and have a transition temperature T c onset ~ 13K. The superconductive materials are advantageously produced from precursor material that contains an excess of the monovalent element(s), as compared to the final composition. Potential uses entail all those uses for which prior art superconductors have been proposed, or in which they have been used.

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