Superconducting materials of high density and crystalline structure produced from a mixture of YBa.sub.2 Cu.sub.3 O.sub.7-x and CuO
US5200387A · kind A · utility
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6Claims
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Key dates
| Filing date | Jul 17, 1990 |
| Grant date | Apr 6, 1993 |
| Priority date | — |
| Expiry date | Jul 17, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/78
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A compact superconductor of the empirical composition YBa.sub.2 Cu.sub.3 O.sub.7-x .times.zCuO, in which z is a number from 0.08 to 0.84, consists of elongated crystals grown together irregularly. It has a density of at least 5.9 g/cm.sup.3, in particular at least 6.02 g/cm.sup.3. It is prepared by mixing a fine-grained superconductor powder of the composition YBa.sub.2 Cu.sub.3 O.sub.7-x with 1 to 10% by weight of CuO, compressing the mixture under a pressure of at least 1 MPa to give a compact, and heating this compact at 940.degree.-985.degree. C. for at least 5 hours.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.