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Preparation and characterization of nanocrystalline Ca-doped CeO2 by sol–gel process

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Abstract

The reactivity of CeO2 is determined by grain size and oxygen vacancies, which can be achieved by doping elements with less oxidation state into CeO2. In this study nanocrystalline Ca-doped CeO2 sol was synthesized from the reaction of hydrate cerium (III) nitrate and calcium nitrate tetrahydrate in alcohol solution after being calcined at 600 °C. X-ray diffraction as well as selected area electron diffraction gave evidence that the synthesized Ca-doped CeO2 samples were well crystalline and had a cubic fluorite structure. TEM observation revealed that Ca-doped CeO2 was composed by nanoparticles with grain size around 8 nm. The Raman spectrum of pure CeO2 consists of a single triple degenerate F2g model characteristic of the fluorite-like structure. In the Ca-doped CeO2 sample, two additional low-intensity Raman bands were detected, thus confirming the formation of the solid solution. The synthesized nanometric powder is expected to be used in solid oxide fuel cells as well as in the catalytic treatment of automobile exhaust fumes.

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Acknowledgments

This work was financially supported by the National Science Council of Taiwan, the Republic of China, grant No. NSC 100-2622-E-020-004-CC3 and NSC 99-2622-E-020-002-CC3, which are gratefully acknowledged.

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Pingtung University of Science and Technology, Neipu, Pingtung, 912, Taiwan

    Lay Gaik Teoh & Ghi Wei Chiang

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  1. Lay Gaik Teoh
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  2. Ghi Wei Chiang
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Correspondence to Lay Gaik Teoh.

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Teoh, L.G., Chiang, G.W. Preparation and characterization of nanocrystalline Ca-doped CeO2 by sol–gel process. J Sol-Gel Sci Technol 64, 530–533 (2012). https://doi.org/10.1007/s10971-012-2885-5

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  • DOI: https://doi.org/10.1007/s10971-012-2885-5

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