【摘要】 用溶胶-凝胶法制备了不同粒度的锐钛矿 TiO₂纳米粉末。当热处理温度不大于520℃时,可以得到稳定的单相锐钛矿结构。用 X 射线衍射方法测量了不同粒度的德拜温度和点阵参数的变化。实验发现,点阵参数和德拜温度的平方都与粒度的倒数成正比,这可能是纳米晶粒的表面张力作用引起的。更多还原

【Abstract】 Anatase structure TiO₂ powders of various crystal size were prepared bySol-Gel method.Single phase anatase structure was obtained for the material with the particlesize less than 70nm.Lattice parameter and Debye Temperature were measured by X-raydiffraction method.The results show that both the lattice parameter and Debye temperaturesquare are inversely proportional to the crystal size of the powders.This may be explained bythe surface tension effect of the nanocrystal.更多还原