| abstract |
To provide a process for producing CeO 2 fine particles having high crystallinity, being excellent in uniformity of composition and particle size and having a small particle size, and a polishing slurry containing such fine particles. n A process for producing CeO 2 fine particles, which comprises a step of obtaining a melt containing, as represented by mol% based on oxides, from 5 to 50% of CeO 2 , from 10 to 50% of RO (wherein R is at least one member selected from the group consisting of Mg, Ca, Sr and Ba) and from 30 to 75% of B 2 O 3 , a step of quenching the melt to obtain an amorphous material, a step of precipitating CeO 2 crystals from the amorphous material, and a step of separating the CeO 2 crystals from the obtained crystallized product, in this order. A polishing slurry containing from 0.1 to 20 mass% of such fine particles. |