Li Ying, Duan Yu-ran, Li Wei-hua
National Research Center of Geoanalysis, Beijing 100037, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2002 Oct;22(5):783-6.
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 investigated with Raman spectrum. The result indicated that rutile characteristic peak (446 cm-1) appeared after 1 h heat preservation at 900 degrees C 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 degrees C anatase transformed into rutile. While the nanophase anatase transited into rutile entirely after 1 h heat preservation at 900 degrees C, which is about 200 degrees C lower than microphase anatase to rutile transition temperature.
采用化学沉淀法合成了不同尺寸（平均粒径为40 nm）的纳米相锐钛矿。利用拉曼光谱研究了纳米相和微米相锐钛矿向金红石的转变。结果表明，微米相锐钛矿在900℃保温1 h后出现金红石特征峰（446 cm-1），升高温度，金红石特征峰（446、610和231 cm-1）强度持续增加，锐钛矿特征峰（639、515和397 cm-1）逐渐降低。在1100℃保温1 h后，锐钛矿转变为金红石。而纳米相锐钛矿在900℃保温1 h后完全转变为金红石，这比微米相锐钛矿向金红石的转变温度低约200℃。
