| 摘要 |
PURPOSE: Provided is a simple method for preparing ultrafine oxide powders with narrow particle size distribution and high purity in a high yield by hydrothermal reaction. CONSTITUTION: The preparation method is characterized by hydrothermal reacting the following materials at 40-300deg.C: (i) at least one material selected from the group consisting of chlorides, nitrates, acetates, hydroxides and hydrates thereof of the element selected from Ca, Sr, Ba, Mg, La and Pb; (ii) at least one material selected from the group consisting of alkoxides, oxides, halides, nitrates, sulfates and hydrolysates thereof of the element selected from Ti, Zr, Hf and Ce; (iii) metal complexing agent such as ethylene diamine tetra acetic acid(ETDA), nitro triacetic acid(NTA), trans-1,2-diamino cyclohexane tetra acetic acid(DCTA), etc.. The material of (i) is mixed with the material of (ii) in a molar ratio of 1 to 0.1-10. The particle size of the resultant oxide powders is in a range of 20nanoneter-1micrometer.
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