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本文采用溶胶-凝胶法制备出纳米 TiO_(2)粉末,并通过热重分析(TG)、差示扫描量热分析(DSC)、X 射线衍射(XRD)、透射电镜(TEM)等实验手段研究了其微观结构及形貌随着热处理温度(T_a)变化的规律。当热处理温度低于500℃时,TiO_2粉末的平均晶粒和颗粒尺寸均小于20nm,所有晶粒均为锐钛矿结构。当热处理温度高于550℃时,TiO_2颗粒及晶粒迅速长大,并且样品中开始出现金红石结构的TiO_2晶粒。当热处理温度高于800℃时,样品中所有晶粒均为金红石结构。
In this paper, nano-sized TiO 2 powder was prepared by sol-gel method and characterized by TG, DSC, XRD and TEM The microstructure and morphology of the microstructure were investigated with the change of heat treatment temperature (T_a). When the heat treatment temperature is lower than 500 ℃, the average grain size and particle size of TiO_2 powder are less than 20nm, and all the grains are anatase. When the heat treatment temperature is higher than 550 ℃, TiO 2 particles and grains grow rapidly, and the sample begins to appear rutile TiO 2 grains. When the heat treatment temperature is higher than 800 ℃, all the grains in the sample are rutile structure.