Preparation and Characterization of Nanocrystalline CeO2 by Precipitation Method
来源期刊：JOURNAL OF RARE EARTHS2002年第6期
论文作者：张伟 李明 董相廷 洪广言 刘桂霞
Key words：rare earths; cerium oxide; nanoparticulate; precipitation method;
Abstract: CeO2 nanocrystalline particulates with different sizes were prepared by precipitation method using ethanol as dispersive and protective reagent. XRD spectra show that the synthesized CeO2 has cubic crystalline structure of space group O5H-FM3M, when calcination temperature is in the range of 250～800 ℃. TEM images reveal that CeO2 particles are spherical in shape. The average size of the particles increases with the increase of calcination temperature. Thermogravimetric analysis indicates that the weight loss of precursor mainly depends on the calcination temperature, and little depends on the calcination time. Measurements of CeO2 relative density show that the relative density of CeO2 nanocrystalline powders increases with increasing CeO2 particle size.
张伟1，李明1，董相廷1，洪广言2，刘桂霞1
(1.Faculty of Applied Sciences, Changchun Institute of Optics and Fine Mechanics, Changchun 130022, China;
2.Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China)
Abstract:CeO2 nanocrystalline particulates with different sizes were prepared by precipitation method using ethanol as dispersive and protective reagent. XRD spectra show that the synthesized CeO2 has cubic crystalline structure of space group O5H-FM3M, when calcination temperature is in the range of 250～800 ℃. TEM images reveal that CeO2 particles are spherical in shape. The average size of the particles increases with the increase of calcination temperature. Thermogravimetric analysis indicates that the weight loss of precursor mainly depends on the calcination temperature, and little depends on the calcination time. Measurements of CeO2 relative density show that the relative density of CeO2 nanocrystalline powders increases with increasing CeO2 particle size.
Key words:rare earths; cerium oxide; nanoparticulate; precipitation method;
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