Titanates in the form of spherical particles and process for...

Details Titanates in the form of spherical particles and process for... Titanates in the form of spherical particles and process for...

C - Chemistry, Metallurgy

01

F

31/112, 23/253

C01F 11/02 (2006.01) C01G 23/00 (2006.01) C01G 23/04 (2006.01) C04B 35/46 (2006.01)

Patent

CA 1266162

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 polydispersion 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 0.930. 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 M2+ compound, wherein M is Ba, Sr or mixtures thereof, and a compound Z capable of complexing with the M2+ ion and 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 M2+. Subsequently the precursor is heated to a temperature of at least 100°C to obtain the corresponding titanate having the above-indicated morphological characteristics.

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