均相沉淀法制备的纳米CeO2颗粒的结构表征

采用均相沉淀法,以Ce(NO3)4为起始原料制得了一种具萤石立方相结构、BET比表面积为101 m2/g的CeO2超细颗粒.同时采用XRD、DSC/TGA、TEM和BET表面测定法对样品性能进行了表征.XRD结果表明,所制得的颗粒具有较大的晶格参数,说明颗粒较小;DSC/TGA测试结果表明,所制备的颗粒失重为16.84%,由此可推断CeO2化合物的分子式为CeO2·2H2O;从TEM测试结果来看,均相沉淀法制备的CeO2颗粒平均直径为10nm,颗粒为球状.将所制得的CeO2颗粒用来制备溶胶,其最大质量浓度可达170g/L,稳定期可达4周以上且无任何沉淀.

Structure Characterization of Nanosized Cerium Oxide Particles Prepared by Homogeneous Precipitation

A novel synthesis method based on homogeneous precipitation using cerium ( Ⅳ ) nitrate as the starting material was developed to prepare ultrafine cerium oxide particles. Properties of the obtained samples were characterized by XRD, DSC/TGA, TEM and BET area measurements. A structure of fluorite cubic phase of the prepared samples with a BET specific surface area of 101 m2/g was obtained. XRD results show that the prepared particles are of a large lattice parameter, which indicates that the particles are very small.Moreover, the DSC/TGA measurement results show that the weight loss of the particles is about 16.84%,TEM that the particles obtained by the homogeneous precipitate method are spherical-like, with an average particle size of about 10nm. The sols obtained from CeO2 particles are of the highest CeO2 mass concentration of more than 170g/L and are stable for more than four weeks without any precipitation.