| 摘要 |
PROBLEM TO BE SOLVED: To provide rare earth metal oxide and rare earth metal-containing compound oxide hollow particles having excellent fluidity, dispersibility, weather resistance and heat resistance. SOLUTION: This method for producing rare earth metal oxide and rare earth metal-containing compound oxide hollow particles comprises suspending a rare earth metal hydroxide, oxide, compound hydroxide and compound oxide sol or slurry or their mixture in an organic solvent to prepare a W/O type emulsion in which the fine water drops containing the sol or slurry therein are homogeneously dispersed in the organic solvent, adding the W/O type emulsion to a >=2C alcohol, washing and filtering the obtained precipitates and subsequently drying and calcining the obtained particles. The obtained rare earth metal and rare earth metal-containing compound oxide particles are spherical, have an average particle diameter in the range of 0.001-500μm, have a hollow structure, and have excellent fluidity, dispersibility, weather resistance and heat resistance.
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