METHOD FOR PRODUCING OXIDE CRYSTAL FINE PARTICLE

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Disclosed is a method for producing an oxide crystal fine particle which has high crystallinity and small particle diameter, while being excellent in uniformity of composition and particle diameter. Also disclosed is an oxide crystal fine particle. Specifically disclosed is a method for producing an oxide crystal fine particle, which is characterized by comprising, in the following order, a step for obtaining a molten material containing an oxide of M (M is one or more elements 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 for rapidly cooling the molten material into an amorphous material; a step for obtaining a pulverized powder having a volume-based particle size distribution of 0.1-40 μm by pulverizing the amorphous material; a step for precipitating an oxide crystal containing M in pulverized particles by heating the pulverized powder; and a step for obtaining crystal fine particles of an oxide containing M by separating the components other than the oxide crystal containing M from the crystal precipitated particles.