Cu^(2+)掺杂氧化钛凝胶的相变研究  

Effects of Cu^(2+) Doping on Phase Transformation of Titania Gels

作　　者：刘步明[1] 闫龙[1] 杨宏伟[1] 

机构地区：[1]榆林学院化学与化学工程学院,榆林719000

出　　处：《硅酸盐通报》2008年第5期933-936,941,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(No.50562003)

摘　　要：本文采用溶胶-凝胶法制备不同含量Cu2+掺杂的纳米氧化钛粉体,利用差热-热重、X衍射仪研究了氧化钛凝胶的相变过程,分析了产物的晶体结构、金红石转变量和锐钛矿晶粒尺度。结果表明,Cu2+的掺杂抑制了锐钛矿相变,促进锐钛矿向金红石相转变,阻碍锐钛矿晶粒的长大,Cu2+掺杂量大于2%(物质的量含量,下同)时,在600℃烧结可获得小于40nm的锐钛矿晶体。Pure and Cu^2＋ doped TiO2 nanopowders were prepared by the sol-gel method. The effect of Cu^2＋ doping on the phase transformation of TiO2 gels, including crystallization temperature, conversion rate and anatase crystal size, was investigated by the TG-DTA, XRD technique. The results showed that Cu^2＋ doping depresses the transformation of gels to anatase and the growth of anatase crystal, as well as accelerates the transformationr of anatase to futile. When Cu^2＋ doping is more than 2% the anatase crystals less than 40 nm can be obtained sintered at 600 ℃.

关 键 词：氧化钛 溶胶-凝胶 相变 离子掺杂 

分 类 号：TB34[一般工业技术—材料科学与工程]