Effect of sintering atmosphere on the pore-structure stability of cerium-doped nanostructured alumina

Kumar, Krishnankutty-Nair P. and Tranto, Janne and Balagopal N., Nair and Kumar, Jalajakumari and Hoj, Jacob W. and Engell, John E. (1994) Effect of sintering atmosphere on the pore-structure stability of cerium-doped nanostructured alumina. Materials Research Bulletin, 29 (5). pp. 551-558. ISSN 0025-5408

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Abstract:	Pore-structure stability of pure and Ce-doped alumina in air and argon atmospheres was studied using DTA, TGA, N2 ads./des. and XRD with a view to understand the importance of the ionic size of the dopant cation on the pore-structure stability of alumina. The ionic size effect was studied by heat treating the Ce-alumina system in both oxidizing and reducing atmospheres to have Ce4+ (87 pm) and Ce3+ (106 pm) respectively. No compound formation between Ce and alumina was observed. In the case of pure alumina there is a drastic reduction in porosity during the transformation to α-alumina. Ce-doped alumina has a higher DSC transformation temperature corresponding to the α-alumina transformation compared to pure alumina. Ce-doped alumina showed higher pore-structure stability compared with pure alumina and the stability was relatively higher in reducing atmosphere (higher Ce3+/Ce4+ ratio, higher effective ionic size) compared with oxidizing conditions (lower Ce3+/Ce4+ ratio, lower effective ionic size).
Item Type:	Article
Copyright:	© 1994 Elsevier Science
Research Group:	Inorganic Materials Science (IMS)
Link to this item:	http://purl.utwente.nl/publications/12686
Official URL:	http://dx.doi.org/10.1016/0025-5408(94)90045-0
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