铈掺杂对二氧化钛纳米颗粒微结构的影响  

The effect of Ce-doping on microstructure of TiO_2 nanoparticles

作　　者：陈兴[1] 吴忠华[1] 蔡泉[1] 李志宏[1] 陈中军[1] 孙民华[1] 车传强[2] 李蓉萍[3] 

机构地区：[1]中国科学院高能物理研究所 [2]内蒙古电力科学研究院,呼和浩特010020 [3]内蒙古大学理工学院,呼和浩特010021

出　　处：《核技术》2004年第12期890-894,共5页Nuclear Techniques

摘　　要：报道了铈掺杂对二氧化钛纳米颗粒微结构的影响。用溶胶—凝胶方法制备了不同铈含量的TiO_2纳米颗粒,在不同的温度下煅烧得到纳米样品系列。用X射线衍射(XRD)、小角X射线散射(SAXS)以及X射线吸收谱(XAFS)技术研究了铈离子掺杂和煅烧温度对二氧化钛纳米颗粒微结构的影响。结果发现:铈离子的掺入有效地抑制了二氧化钛纳米颗粒的生长和在高温下的相变。纳米颗粒"自相似"的分形结构与铈含量和煅烧温度有关。用核心一壳层模型描述了钛的近邻原子结构。The effect of Ce-doping on microstructure of TiO_2 nanoparticles is reported in this paper. The Ce-doped TiO_2 samples were prepared by the sol-gel method under acidic condition and calcined at different temperatures. Influence of the cerium dose and calcination temperature on the microstructure of the TiO_2 nanoparticles was studied by X-ray diffraction (XRD), small angle X-ray scattering(SAXS) and X-ray absorption fine structure techniques. It is found that the cerium doping inhibits the growth of nanoparticles and the transformation of anatase to rutile at elevated temperature. The 'self-similar' fractal structures are dependent on the Ce content and annealing temperature. The core-shell model was used to describe the near-neighbour structural parameters around Ti.

关 键 词：铈掺杂 二氧化钛 X射线衍射 小角X射线散射 X射线吸收精细结构 

分 类 号：O647[理学—物理化学]