Method for producing fine particles of barium ferrite
US5433878A · kind A · utility
17Cited by
0References
13Claims
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Key dates
| Filing date | Apr 19, 1994 |
| Grant date | Jul 18, 1995 |
| Priority date | — |
| Expiry date | Apr 19, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/62
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for producing fine particles of barium ferrite, which comprises reacting an aqueous solution comprising an iron compound, a barium compound and an alkaline substance, wherein the molar ratio of hydroxyl groups of the alkaline substance to the total of anions of the iron compound and the barium compound in the aqueous solution is from 1 to 4, and the reaction is carried out at a temperature of at least 250.degree. C. under a pressure of at least 200 kg/cm.sup.2 using a flow type reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.