纳米TiO2粉晶的XRD研究

用溶胶－凝胶法制备了纳米ＴｉＯ２粉晶，对不同温度自理的系列粉末用Ｘ射线衍射进行了研究，发现所得粉晶随热处理温度的不同发生了从锐钛矿到金红石相的转变。对系列粉晶进行了Ｘ射线衍射点阵参量计算，结合所得的晶粒度和微结构参数，发现纳米ＴｉＯ２粉晶组元中存在着晶格畸变。

The XRD Study of Nanometer TiO_2 Powders

Nanocrystalline TiO2 powder was prepared by sol - gel process. The structures of TiO2 powders annealed at various tempera-tures were study by X -ray diffraction (XRD). The results showed that in the TiO2 powders, the anatase transformed to rulite with the an-nealed temperatures higher. Calculating the lattice parameter of series TiO2 samples, and combining the grain - size and substructure pa-rameter, we found that there was lattice distortion at the nanocrystalline TiO2 powder. And with the annealing temperatures increasing, the particle grown, and the composition of anatase in TiO2 powder decreased gradually, while the composition of rutile increased gradually. The lattice parameter of TiO2 powders showed distinct change. There were also closer relations between the annealing temperatures and lattice distortion and grain - size. That showed size offeot and temperature effect.