| 摘要 |
Disclosed is a method for the preparation of a high-quality sintered body of a rare earth oxide or a composite oxide of a rare earth oxide and an adjuvant oxide such as aluminum oxide. The method comprises shaping a rare earth oxide powder characterized by specified particle diameter distribution values of D50 and D90 and a specified specific surface area or a powder blend of the rare earth oxide and adjuvant oxide into a powder compact and subjecting the powder compact to a sintering heat treatment at a specified sintering temperature by increasing and decreasing the temperature up to and from the sintering temperature each at a rate not exceeding a specified upper limit.
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