溶胶-凝胶法制备纳米CeO_2晶体

The preparation of nano CeO_2 by sol-gel method

CeO2是一种稀土类研究较为广泛且多用途的功能材料。本实验以六水硝酸铈和聚乙二醇为原料,采用溶胶法制备纳米CeO2晶体。主要研究了反应温度、焙烧温度对粉体性质的影响。结果表明,聚乙二醇溶胶法可制得纳米CeO2。在65℃下溶胶制备的CeO2粉体较均匀,分散性也较好,随着焙烧温度升高,CeO2保持立方晶型不变,粒径增大,结晶更完善。800℃焙烧所得的CeO2晶的形貌趋于球形,直径在20~50nm。

CeO2 is a widely used material. Nanosized cerium oxides were prepared by polyethylene and Ce（NO3）3· 6H2O. It was systemically investigated the reacting temperature and the sintering temperature to the influence of the pow ders＇property. Nano-sized CeO2 particles can be prepared by sol-gel method. CeO2 particles reacting at 65℃ were resular in shape and had good distribution. With the increasing in calcinations temperatures, the crystal form of CeOz particles was cubic system and donen＇t change, with diameters increase, and the crystallization became more perfect, the particles sintering at 800℃ were spherical, and the size is between 20 and 50nm.