Titanates in the form of spherical particles and process for preparing the same
US4755373A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1986 |
| Grant date | Jul 5, 1988 |
| Priority date | — |
| Expiry date | Aug 12, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/64
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Titanates of barium, strontium, or mixed barium and strontium consisting essentially of solid, non-aggregated particles having diameters ranging from 0.05 to 1 micron and a narrow particle size distribution expressed by the polydispersity index, dw/dn, not greater than 1.20, where dw is the weight average diameter and dn is the number average diameter, said particles being essentially perfectly spherical with a total mean axial ratio of at least 0.93. These titanates are prepared by a process which comprises precipitating of a peroxidic precursor having the same morphological characteristics of the titanates. The peroxidic precursor is obtained by heating an alkaline solution comprising a complex of a titanium compound with a peroxidic compound, an M.sup.2+ compound, wherein M is Ba, Sr or mixtures thereof, and a compound Z capable of complexing with the M.sup.2+ ion oxidizable by the peroxidic compound under the conditions of reaction to produce soluble decomposition products and provide a homogeneous precipitation of the peroxidic precursor comprising titanium and M.sup.2+. Subsequently the precursor is heated to a temperature of at least 100.degree. C. to obtain the correspondin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.