Bi oxide superconductors
US5508252A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1994 |
| Grant date | Apr 16, 1996 |
| Priority date | — |
| Expiry date | Jun 14, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/784
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A substance which has a Cu--O plane containing crystal structure in its unit cell and which is called a Bi oxide superconductor consisting essentially of Bi, Sr, Ca, Cu, and O. Not only part of Bi but also part of Sr and/or Ca of the Bi oxide superconductor is substituted for Pb and rare earth elements (RE), respectively. The Pb substitution relaxes the structural modulation which is closely related to superconductivity of the Bi oxide superconductor and the RE substitution controls its carrier concentration. Accordingly, superconducting properties such as transition temperature and critical current density can be improved remarkably. In addition, not only oxide superconductors with excellent superconductivity can be prepared in a low oxygen content but also the surface condition of the prepared superconductors is stable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.