Method of producing compound oxide by using partly citrating process
US5449660A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 16, 1993 |
| Grant date | Sep 12, 1995 |
| Priority date | — |
| Expiry date | Mar 16, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/738
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of producing a compound oxide of elements including at least one of thallium, bismuth, lead, antimony, yttrium, each of rare earth elements, each of transition metal elements, each of alkali metal elements and each of alkaline earth metal elements. The method is comprised of the steps of (i) reacting at least one of carbonate, basic carbonate, hydroxide and co-precipitates of each of the above-mentioned elements with an amount of citric acid that is less than the weight equivalent of citric acid needed to form a completely citrated compound, and (ii) calcining the partly citrated compound. The co-precipitate can be one of a carbonate, a basic carbonate and a hydroxide of each of the above-mentioned elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.