掺Ho纳米TiO2粉晶的结构及光学特性  

The Structure and Optical Characteristic of Ho-doped Nano-TiO_2

作　　者：刘鹏[1] 李蓉萍[1] 董海成[1] 张海民[2] 李忠贤[1] 

机构地区：[1]内蒙古大学物理科学与技术学院,呼和浩特010021 [2]兰州理工大学理学院,兰州730050

出　　处：《内蒙古大学学报（自然科学版）》2008年第4期407-410,共4页Journal of Inner Mongolia University：Natural Science Edition

基　　金：内蒙自然科学基金项目(20010901-09)

摘　　要：采用溶胶-凝胶法制备了掺1at%Ho的纳米TiO2粉末,并分别在400℃、600℃与800℃下对样品进行热处理,通过XRD和紫外可见吸收测试,对掺杂纳米TiO2粉末的晶体结构与光学性质进行了研究.分析发现掺杂提高了样品的相变温度,减小了样品的晶粒尺寸,使样品的吸收明显增强,光学带隙增加.而且随着热处理温度的升高,样品的晶粒尺寸增大,晶格常数a值减小,c值增大,吸收减小而光学带隙增大.The nano-TiO2 powder,which was doped with Holmium,is prepared by sol-gel method.The samples are annealed at 400 ℃,600 ℃ and 800℃.The crystal structure and optical properties of the powers are studied by XRD and the UV spectrophotometry.The results show that Ho doping leads to phase transformation temperature increase,the grain size decrease,and the photoabsorption and optical band gap increase.Along with increase of the annealing temperature,the lattice constant a increases,c decreases,the photoabsorption weakens and the optical band gap broadens.

关 键 词：稀土掺杂 纳米TIO2 晶格结构 光学带隙 

分 类 号：O472.3[理学—半导体物理]