Patent ID: 8133836
Filing Date: 2012-03-13
Classification: B82Y,C01G,C01P

Abstract:
1. A process for producing ceria-zirconia solid solution crystal fine particles, comprising (1) obtaining a melt containing, as represented by mol % based on oxides, from 5 to 50% of (ZrO 2 +CeO 2 ), from 10 to 60% of RO (wherein R is at least one member selected from the group consisting of Mg, Ca, Sr and Ba) and from 25 to 70% of B 2 O 3 by heating at a temperature of from 1200 to 1600° C., (2) quenching the melt to obtain an amorphous material, (3) heating the amorphous material at a temperature of from 550 to 1000° C. to precipitate ceria-zirconia solid solution crystals in the amorphous material, and (4) separating components other than the ceria-zirconia solid solution crystals from the obtained precipitates to obtain the ceria-zirconia solid solution crystal fine particles, in this order.