锐钛矿型TiO_2纳米粉的低温热容研究  

Low Temperature Heat Capacity of the Anatase Nano-Powder TiO_2

作　　者：吴新明[1] 邸友莹[1] 谭志诚[2] 屈松生[1] 

机构地区：[1]武汉大学化学与环境科学学院,武汉430072 [2]中国科学院大连化学物理研究所,大连116023

出　　处：《无机材料学报》2001年第1期159-164,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金资助项目!(29773048)

摘　　要：采用溶胶－凝胶法制备了１６、２６ｎｍ锐钛矿型ＴｉＯ２纳米晶超微粉末，测定了其纳米尺寸和晶态．在７８～３７０Ｋ温区测定了热容，拟合出热容随温度变化的多项式方程，并与锐态矿型粗晶ＴｉＯ２热容文献值进行比较，从能量不同的角度分析了各曲线不同的原因．The nanocrystalline TiO2 ultrafine powders in anatase phase were prepared in 16nm, 26nm by means of a sol-gel method. The particle sizes and the crystallographic phase were determined. Heat capacities in the temperature range of 78 similar to 370K were also measured, and the polynomial equations expressing the change of heat capacity with temperature were fitted. The obtained values of the heat capacity were compared with those of the coarse crystal from the literature. The relationship between heat capacities and the particle sizes of nanocrystalline TiO2 were demonstrated in the view of energetics.

关 键 词：锐钛矿型 二氧化钛 纳米晶超微粉 溶胶-凝胶法 低温热容 

分 类 号：TQ134.11[化学工程—无机化工]