摘要
以硝酸铁-聚乙烯醇为反应体系,采用低温燃烧合成法制备了-αFe2O3粉体。通过X射线衍射、扫描电镜、透射电镜和能谱分析等测试手段,对产物进行了表征。结果表明,硝酸铁和聚乙烯醇的摩尔比为1∶0.5,150℃时制备的干凝胶加热至400℃可发生燃烧合成反应,此温度下保温煅烧1 h后可得到纳米-αFe2O3粉体(含少量的-γFe2O3),反应产物颗粒边缘光滑,粒度分布均匀,呈褐红色。XRD结果表明,有机物已完全分解,经XRD计算、TEM及纳米粒子分析仪测定,晶粒尺寸在20 nm^50 nm之间。
Nanocrystalline α-Fe2O3 was prepared by low nitrate and polyvinyl alcohol （PVA） . Nanocrystalline EDS. The results showed that α-Fe2O3 particle edges are full reaction of combustion when the mole ratio of ferric temperature combustion synthesis method using ferric α-Fe2O3 was characterized by XRD, SEM, TEM and smooth and have uniform particle size distribution with nitrate to polyvinyl alcohol is 1 to 0.5, and the products present red granular substances. The gels which got from at 150 ℃ were ignited at 450 ℃ . After calcining the reaction at 450 ℃ for 1.5 h, α-Fe2O3 were obtained and have a little γ-Fe2O3. Characterized By TEM, XRD and Clouter N4 Plus Submicron Sizer for particle size, the grain size is measured in the range from 20 nm to 50 nm.
出处
《微细加工技术》
2008年第2期12-14,18,共4页
Microfabrication Technology
基金
上海市教委重点项目资助(04-03FZ02)
陕西省教育厅自然科学专项基金资助项目(05JK135)
