| abstract |
Non-magnetic particles, in particular, of an oxide such as cerium oxide, zirconium oxide, aluminum oxide, silicon oxide or iron oxide which have the shape of a plate and have an average particle diameter in the direction of the plate surface in a range of 10 to 100 nm; and a method for producing the above non-magnetic particles of the oxide which comprises adding a salt of the above element to an aqueous alkaline solution to provide a hydroxide or hydrate thereof, heating the hydroxide or hydrate in the presence of water at a temperature in the range of 110 to 300° C., followed by filtration and drying, and further heating the resultant product in air at a temperature in the range of 300 to 1200° C., to thereby produce particles of the oxide. The above non-magnetic particles, in particular, of on oxide has a narrow distribution of particle diameter, is extremely reduced in sintering or coagulation, and exhibits good crystallinity. |