中文摘要：

以钛酸丁酯Ti（OC4H9）4、冰醋酸、去离子水和无水乙醇为原料，采用溶胶-凝胶法制得纳米二氧化钛粉体，并用不同的温度对纳米二氧化钛粉体进行热处理，得到不同晶相的TiO2粉体。利用X射线衍射仪（XRD）和紫外可见光谱（UV／vis）对纳米二氧化钛粉体进行表征。结果表明，在500℃退火时，TiO2粉体中是单一的锐钛矿相结构，在700℃退火时，TiO2粉体中开始出现金红石相结构，随着退火温度的升高，金红石相结构含量逐渐增加，在900℃退火时，锐钛矿相几乎全部转化为金红石相。在600℃退火时，得到的纯锐钛矿相的纳米晶透射率最低，而且在700℃退火时的透射率要比500℃退火时的透射率低，说明锐钛矿相中混入微量金红石相能显著降低透射率。同时，在600℃退火时，得到的纯锐钛矿相的纳米晶光吸收效果最理想。

英文摘要：

The nanostructure TiO2 powder was prepared by sol-gel method, using Ti（OC4 H9 ）4, glacial acetic acid, deionized water and anhydrous alcohol as raw materials. The TiO2 powder samples were annealed with different temperature to get different phase structures. Nanostructure TiO2 powder is characterized by X-ray diffraction（XRD） and ultraviolet（UV/visible spectra）. The results show that TiO2 powder sample appears pure anatase phase structure with 500℃ annealing, with increasing annealing temperature to 700℃, sample appears a small quantity of rutile phase structure, with increasing annealing temperature, the quantity of rutile phase gradually increase, with increasing an- nealing temperature to 900 ℃ all anatase phase almost transform to a pure rutile phase. The transmissivity of the TiO2 powder sample with a pure anatase phase is the minimum with 600℃ annealing. Moreover the light transmissivity of tne sample with 700℃ annealing is lower than it with 500℃ annealing, shows that nanostructure TiO2 anatase phase mixing with a small amount of rutile phase, it can be reduced in transmissivity. And the optic absorption of the TiO2 powder sample with a pure anatase phase is the largest with 600℃ annealing.