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Influence of Oxygen Substoichiometry on the Dielectric Properties of BaTiO3-δNanoceramics Obtained by Spark Plasma Sintering

Voisin, Christophe and Guillemet-Fritsch, Sophie and Dufour, Pascal and Tenailleau, Christophe and Han, Hyuksu and Nino, Juan C. Influence of Oxygen Substoichiometry on the Dielectric Properties of BaTiO3-δNanoceramics Obtained by Spark Plasma Sintering. (2013) International Journal of Applied Ceramic Technology, 1-2. 2-12. ISSN 1546-542X

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Official URL: http://dx.doi.org/10.1111/ijac.12058

Abstract

Oxygen-deficient BaTiO3-d nanoceramics were prepared by spark plasma sintering. Partially reduced raw nanopowders led to unusual dielectric properties. A short postsintering treatment was performed to reach a high er/tan d, which makes them attractive for industrial applications such as low-frequency capacitors. Surprisingly, our ceramics also remained black even after annealing for 5 days at 850°C in air, indicating the presence of barriers against oxygen diffusion. This exceptional behavior in pure barium titanate was consistent with a core–shell structure made of semiconductive grains and insulating grain boundaries, due to the presence of Ti3+/Ti4+ and oxygen vacancies.

Item Type:Article
Additional Information:Thanks to Wiley-Blackwell. The definitive version is available at http://onlinelibrary.wiley.com/doi/10.1111/ijac.12058 /abstract;jsessionid=5EAF2923C8780212C40B00CDDAAD9B66.d02t03
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > University of Florida (USA)
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Deposited By: cirimat webmestre
Deposited On:23 Jul 2013 09:38

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