Rare earth substituted thallium-based superconductors

Details Rare earth substituted thallium-based superconductors Rare earth substituted thallium-based superconductors

1995-04-13

1997-07-08

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Thallium containing

505783, 252521, H01B 1200, C04B 3550

Patent

active

056460945

ABSTRACT:
The present invention comprises novel superconducting materials exhibiting superconductivity at temperatures exceeding 90 K. with chemical formula Tl.sub.a Pb.sub.b Ca.sub.c Sr.sub.d R.sub.e Cu.sub.f O.sub.g where R=Y or the lanthanide rare earth elements and where 0.3.ltoreq.a,b.ltoreq.0.7, 0.05.ltoreq.c.ltoreq.1.1,2-c.ltoreq.d.ltoreq.1.95, 0.05.ltoreq.e.ltoreq.1, 1.9.ltoreq.f.ltoreq.2.1 and 6.5.ltoreq.g.ltoreq.7.5. These compounds, which are layered perovskite-like oxides, exhibit a high chemical stability, form readily into nearly single phase, do not require adjustment of oxygen stoichiometry after synthesis and compositions may be chosen allowing superconductivity at temperatures exceeding 100 K. A preferred form of the superconducting materials is the range of compositions given by the chemical formula

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