本文以TiCl4为主原料，用NH4NO3分解法得到TiO2粉末．结果表明，TiCl4水解后立即中和至中性的样品A为单一锐钛矿，而TiCl4水解一天后再中和的样品B为锐钛矿和金红石的混合晶型；二者在923K时发生相变，由低温稳定相锐钛矿转变成高温稳定相金红石；粒子的粒径分布范围狭窄，在10～20nm之间，平均粒径约15nm．另外，对单一锐钛矿样品A进行了相转位动力学研究，其相转位活化能为113．5±8．97kJ／mol．
Nanocrystalline titania powder was obtained from titanium tetrachloride by chemical method.After hydrolysis of titanium tetrachloride, one sample was neutralized by NH3.H2O at once, and the other was neutralized one day later. The former was detected to be sphericed anatase titania,whereas the latter a mixture of anatase and rutile titania. Both samples have the average diameters of 15nm, ranging from 10 to 20nm. Phase transformation from anatase to rutile occurs at 923K,and its activation enthalpy is 113.5±8．97kJ／mol．
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