Process for preparing a rare earth borate by reacting together at least one rare earth salt, boric acid and a base
US6352678B1 · kind B1 · utility
4Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2000 |
| Grant date | Mar 5, 2002 |
| Priority date | — |
| Expiry date | Sep 27, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B35/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a process for preparing a rare earth borate by reacting together at least one rare earth salt, boric acid and a base. The process is characterized in that the reaction is carried out using an excess of acid with respect to the stoichiometry and under conditions such that the pH of the reaction medium at the end of the reaction is in the range of 6 to 8. The precipitate formed is then recovered and calcined. The phase purity of the borate obtained is good and it can be used as a luminophore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.