Bismuth-lead-strontium-calcium-cuprate superconductors
US4880771A · kind A · utility
42Cited by
1References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1988 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | Feb 26, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/81
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Novel superconductive Pb-substituted oxides are disclosed. The oxides all have layered perovskite-like crystal structure, and manifest superconductivity (R=o) above about 77K. The materials are described by the nominal formula X.sub.2+x M.sub.3-x Cu.sub.2 O.sub.8.+-..delta., where X is Bi and Pb, M is Sr and Ca, 0.ltoreq..times..ltoreq.0.3, 0.ltoreq..delta..ltoreq.0.5, the Pb/Bi ratio is between about 0.2 and about 0.5, and the Sr/Ca ratio is between 0.5 and 2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.