【摘要】 采用化学沉淀法制备出 40nm的锐钛矿 ,并用拉曼光谱对纳米和块体锐钛矿到金红石的相转变过程进行了研究。实验结果表明 :对于块体锐钛矿 ,在 95 0℃保温 1h ,金红石的特征峰 44 6cm-1开始出现 ,随着温度的升高 ,金红石的特征峰 44 6 ,6 10和 2 31cm-1继续增强 ,锐钛矿的特征峰 6 39,5 15和 397cm-1逐渐减弱。在 110 0℃保温 1h ,锐钛矿转变为金红石 ;对于纳米锐钛矿 ,在 90 0℃保温 1h后几乎全部转变为金红石 ,比块体 (微米级 )锐钛矿到金红石的相转变温度降低了约 2 0 0℃。更多还原

【Abstract】 The nanophase anatase of different size (the average is 40 nm) was synthesized with chemical precipitation method.Transition from nanophase and microphase anatase to rutile were invesigated with Raman spectrum.The result indicated that rutile characteristic peak (446 cm -1) appeared after 1 h heat preservation at 900 ℃ for microphase anatase,raising the temperature characteristic peak intensity of rutile (446,610 and 231 cm -1) continued to increase and characteristic peak of anatase (639,515 and 397 cm -1) decreased bit by bit.After 1 h heat preservation at 1 100 ℃ anatase transformed into rutile.While the nanophase anatase transited into rutile entirely after 1 h heat preservation at 900℃,which is about 200℃ lower than microphase anatase to rutile transition temperature.更多还原