METHOD FOR PREPARING RARE EARTH COMPOUND PARTICLES, RARE EARTH OXIDE PARTICLES, AND RARE EARTH OXI

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Rare earth compound particles are prepared by a step of heating an aqueous solution containing rare earth metal ions and urea to form a rare earth compound by a reaction of a hydrolysis product of urea, and the rare earth metal ions. In the heating step, heating the aqueous solution into which an acetylene glycol-ethylene oxide adduct is added.