Co-precipitation synthesis of precursors to bismuth-containing superconductors
US5077265A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1990 |
| Grant date | Dec 31, 1991 |
| Priority date | — |
| Expiry date | Nov 30, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/738
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A co-precipitation synthesis of precursors to bismuth-containing ceramic superconducting materials is disclosed in which bismuth and at least one other approrpiate metal are dissolved in a non-aqueous acidic solvent, which are then recovered as a homogeneous dry powder. The mixed metal salts are co-precipitated from aqueous solution in the form of the corresponding homogeneous hydroxycarbonate precursor mixture by reaction with either sodium carbonate or potassium carbonate. The homogeneous precursor may be then converted to the BiCuSrCuO.sub.x ceramic by calcining the mixed hydroxycarbonate to a powder, compressing said powder into a green compact, sintering said green compact at a temperature of at least 750.degree. C., and cooling the ceramic material so produced at a controlled rate, preferably about 50.degree. C./minute.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.