PROCESS FOR PRODUCING OXIDE CRYSTAL FINE PARTICLES

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To provide a process for producing fine particles of crystalline oxide which have high crystallinity, are excellent in uniformity of the composition and particle diameter, and have a small particle diameter, and such fine particles of crystalline oxide. A process for producing fine particles of crystalline oxide, which comprises : a step of obtaining a melt containing an oxide of M (M is at least one member selected from the group consisting of Ce, Ti, Zr, Al, Fe, Zn, Mn, Cu, Co, Ni, Bi, Pb, In, Sn and rare earth elements (excluding Ce)) and B2O3, a step of rapidly cooling the melt to form an amorphous material, a step of pulverizing the amorphous material to obtain a pulverized material having a volume-based particle size distribution within a range of from 0.1 to 40 μm, a step of heating the pulverized material to precipitate an oxide crystal containing M in the pulverized particles, and a step of separating components other than the oxide crystal containing M from the crystal-precipitated particles to obtain fine particles of crystalline oxide containing M, in this order.