摘要
我们在对纳米ＴｉＯ２样品进行差热分析（ＤＴＡ）时发现，其ＤＴＡ曲线上出现了两个吸热峰．通过对原始样品和一系列热处理样品进行Ｘ射线衍射（ＸＲＤ）实验，我们证实：第一吸热峰对应于物理或化学吸附的脱除过程，第二吸热峰完全对应于纳米ＴｉＯ２原始样品从板钛矿结构经锐钛矿结构向着金红石结构的相变；这一相变促成了纳米晶粒的生长．
Using DTA (Differential Thermal Analysis) measurement on the nanostructured TiO 2,we find two endothermic peaks on DTA curve.By XRD (X-Ray Diffraction) analysis on a series of heat-treating samples,we find some patterns as follows:the first endothermic peak corresponds to the desorption of physical or chemical absorption; the second one is related to the structural phase transition from brookite to rutile passing by anatase,and the growth of nanostructured crystalline grains will benefit from this structural transition.
基金
国家自然科学基金
关键词
差热分析
微结构
结构相变
纳米材料
二氧化钛
nanostructured TiO 2
differential thermal analysis (DTA)
XRD microstructure
structural phase transition.
