Method for preparing barium titanate
US9327995B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 20, 2010 |
| Grant date | May 3, 2016 |
| Priority date | — |
| Expiry date | Apr 24, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/80
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided is a method for preparing barium titanate, which comprises: dissolving BaCl2.2H2O into TiCl4 solution to prepare Ba—Ti mixed solution with a Ba/Ti mol ratio of 1:1; adding ammonia and ammonium bicarbonate into deionized water to prepare synthetic agent with a NH4OH/NH4HCO3 mol ratio of 5:1; adding Ba—Ti mixed solution and synthesis agent into a reactor for synthesis to obtain a slurry; pressure filtering, thermal washing and then pressure filtering, to obtain a filter cake; calcining the filter cake for 1 hour at 590-610° C., followed by further calcining for 2 hours at 700-950° C.; crushing the obtained solid produced by a crusher, and thereby obtaining barium titanate. The obtained barium titanate is spherical, and has a narrower particle size distribution. The method reduces costs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.