Barium borate preparation
US4897249A · kind A · utility
5Cited by
2References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1989 |
| Grant date | Jan 30, 1990 |
| Priority date | — |
| Expiry date | Apr 3, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B35/126
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A filtered solution of barium hydroxide octahydrate reacted with an aqueous solution of boric acid to provide hydrated .gamma. barium borate having a barium to boron ratio of 1:2 and having fine particle size. The hydrated .gamma. barium borate was converted to the anhydrous .gamma. form at about 300.degree. to 400.degree. C. Further heating to about 600.degree. to 800.degree. C. converted the product to .beta.-BaB.sub.2 O.sub.4. The conversion to the .beta.-form is preferably during sintering of a ceramic dielectric composition to which the .gamma.-BaB.sub.2 O.sub.4 has been added as a flux.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.