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Hot compaction of nanocrystalline TiO2 (anatase) ceramics. Mechanisms of densification: Grain size and doping effects

Weibel, Alicia and Bouchet, Renaud and Bouvier, P. and Knauth, Philippe Hot compaction of nanocrystalline TiO2 (anatase) ceramics. Mechanisms of densification: Grain size and doping effects. (2006) Acta Materialia, vol. 5 (n° 13). pp. 3575-3583. ISSN 1359-6454

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Official URL: http://dx.doi.org/10.1016/j.actamat.2006.03.033

Abstract

The hot compaction of nanocrystalline TiO2 anatase powders is investigated using dilatometry. The constant rate of heating (CRH) method is applied to determine effective activation energies of the processes involved during sintering. Grain size and doping effects are studied, using dopant cations of different radius and charge: Zn2+, Al3+, Si4+, Nb5+. The results are interpreted by a mechanism including superplastic deformation and boundary diffusion. The former is predominant for small particles and low temperature, whereas the latter is more important for larger particles and higher temperature. Dopant effects on densification kinetics are discussed in view of defect chemistry.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Acta Materialia website : http://www.sciencedirect.com/science/journal/13596454
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Université de Provence - Aix-Marseille I (FRANCE)
Other partners > Institut National Polytechnique de Grenoble (FRANCE)
Other partners > Université Joseph Fourier Grenoble 1 - UJF (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Thomas Bonnecarere
Deposited On:18 Sep 2008 12:37

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