| 摘要 |
Firstly, a powder matrix is kept in a fluent state, said powder matrix consisting of a first oxide having an absorbed water amount of 0.1 to 50%, an averaged particle diameter of 0.005 to 0.5 mum and a surface hydroxyl group number of 0.1 to 25 mumol/m2. Then, one or both of a halide and an alkoxide including metal or semi-metal identical with or different from the metal or semi-metal constituting said first oxide is allowed to contact with said powder matrix kept in the fluent state, by means of an inert carrier gas, and then they are heated at a temperature of from 25 to 800° C., to thereby coat said powder matrix by a coating layer consisting of a second oxide. Further, a reaction by-product consisting of one or both of a hydrogen halide or an alcohol generated by said contacting is heated at a temperature of from 200 to 1000° C. within the inert carrier gas to thereby eliminate the reaction by-product. This invention enables by a chemical means, for a powder matrix consisting of a first oxide, the surface of said powder matrix to be uniformly coated at a low cost by a coating layer consisting of a second oxide identical with or different from the first oxide. In said oxide powder, both the powder matrix and the coating layer can develop their respective physical and chemical characteristics satisfactorily.
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