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| Preparation of ceria–based nanocrystalline powders doped with calcium, samarium and gadolinium by an improved homogeneous precipitation |
| YAN Ping ; SHAO Zhongbao; HU Xiaomin |
1.College of Resources and Civil Engineering; Northeastern University; Shenyang 110004
2.Applied Chemistry Department; Shenyang Institute of Chemical Technology; Shenyang 110142
3.College of Science; Northeastern University; Shenyang 110004 |
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Cite this article:
YAN Ping SHAO Zhongbao HU Xiaomin. Preparation of ceria–based nanocrystalline powders doped with calcium, samarium and gadolinium by an improved homogeneous precipitation. Chin J Mater Res, 2009, 23(4): 405-409.
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Abstract Ceria–based precursors doped with calcium, calcium–samarium and calcium–gadolinium were prepared by an improved homogeneous precipitation method using ammonium oxalate as precipitant, high purity reagents Ce(NO3)3·6H2O, Ca(NO3)2·4H2O, Sm2O3 and Gd2O3 were used as raw materials, urea was used as pH adjuster of the mixed solution. The as–synthesized precursor were calcined at 700 ℃ for 4.5 h. The calcined powders were characterized by X–ray diffraction (XRD), scanning electron microscopy(SEM), and Brunauer–Emmett–Teller(BET) specific surface area measurements. The results show that the calcined powders have satisfactory characterizations when the initial hydrolysis pH is approximately 1, the total concentration of mixed cation ions is 0.5 mol/L, and the initial concentration of precipitant is 0.05 mol/L. The powders after calcined have a single cubic fluorite crystalline structure and higher phase purity, with spherical nano–sized particles about 34–39nm in diameter and narrow size distribution. In this study, doped ceria precursors were redispersed and washed in ethanol can alleviate the degree of agglomeration of the calcined powders.
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Received: 31 March 2009
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| Fund: Supported by the National Natural Science Foundation of China No.30270761. |
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