ALPHA-ALUMINA SUPERFINE PARTICLE AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To efficiently obtain high purityα-alumina superfine-particle powder having an average particle diameter of <=0.1μm and containing very little of impurities such as metallic oxides except alumina. SOLUTION: A method for producingα-alumina superfine particles features firingγ-alumina superfine particles produced by a gas phase method up to substantial transformation intoα-alumina superfine particles. Thisα-alumina superfine-particle powder substantially composed of theα-alumina phase and having an average particle diameter of <100 nm is provided.