Oxide superconductor and process for preparation thereof
US5308799A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1992 |
| Grant date | May 3, 1994 |
| Priority date | — |
| Expiry date | Feb 6, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/785
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to an oxide superconductor comprising a composite oxide of RE , Ba and Cu, wherein the superconductor comprises a micro structure comprised of a monocrystalline REBa.sub.2 Cu.sub.3 O.sub.7-x phase (123 phase) and a RE.sub.2 BaCuO.sub.5 phase (211 phase) finely dispersed therein, the 123 phase being formed in a plurality of domains respectively for individual RE compositions and in the order of the 123 phase forming temperatures in respective layers. The present invention relates also to a process for the preparation of an oxide superconductor, characterized by forming a layer from a mixed powder of the RE, Ba and Cu compounds, forming another layer(s) of a mixed powder of RE, Ba and Cu compounds having another RE composition(s) different from the above-mentioned RE composition in the 123 phase forming temperature to form a multi layer structure, putting said plurality of layers on top of one another so that the 123 phase forming temperatures in respective layers continue towards a higher temperature side or a lower temperature side, subjecting the assembly to press molding to form a precursor, putting said precursor on a supporting material with the la…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.