摘要
以四氯化钛为原料 ,采用溶胶凝胶法技术合成路线 ,可以获得平均粒径在 30到 4 0纳米的二氧化钛粉末。在X—射线衍射 (XRD)和拉曼散射 (Raman)测试技术下 ,分析得到红外干燥方式下可使锐钛矿向金红石相转化 ,同时由于TiO2 纳米晶粒的尺寸效应以及弱的结晶性和局部格点不完善 ,使得Raman光谱特征峰向低波数移动。此外 ,随着反应温度的提高 ,逐步有金红石相产生 ,而 4 48cm- 1Eg 活性模对温度的依赖性体现了反斯托克斯现象。
Nanosized TiO 2 powder with anatase and rutile structures was synthesized by a sol-gel method using TiCl 4 ethanol solution as a precursor. Calculated by the scherrer ffls equation, the average size is from 30 to 40 nanometer. The experimental technique XRD and Raman were used to characterize crystallinity and microstuctures of the synthesized specimens. In the way of infrared drying, there is a transformation between anatase and rutile phase; while the Raman peaks shift left which attributes to the size-effect, poor crystallinity and local lattice-imperfections. In addition, with the increase of reaction temperature, the rutile phase is gradually formed. And 448 cm -1 E g mode displays a strong non-stoichimetry effect.
出处
《光散射学报》
2002年第4期208-211,共4页
The Journal of Light Scattering
