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From core–shell BaTiO3@MgO to nanostructured low dielectric loss ceramics by spark plasma sintering

Berthelot, Romain and Basly, Brice and Buffière, Sonia and Majimel, Jérôme and Chevallier, Geoffroy and Weibel, Alicia and Veillère, Amélie and Etienne, Laetitia and Chung, U-Chan and Goglio, Graziella and Maglione, Mario and Estournès, Claude and Mornet, Stéphane and Elissalde, Catherine From core–shell BaTiO3@MgO to nanostructured low dielectric loss ceramics by spark plasma sintering. (2014) Journal of Materials Chemistry. C, 2 (4). 683-690. ISSN 2050-7526

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Official URL: http://dx.doi.org/10.1039/c3tc31990c

Abstract

We report a quite general way to design materials with tailored properties by combining thermolysis and fast sintering approaches. Submicrometric-sized BaTiO3 particles have been directly coated in a continuous nanocrystalline MgO shell through a thermal decomposition process. The electron microscopy study has evidenced a shell composed of randomly oriented MgO nanocrystallites. The final nanostructured composite, made of sub-micrometric MgO and BaTiO3 grains uniformly distributed, is obtained in situ during the SPS process. Such a rearrangement can be explained by the initial core–shell architecture, the weak cohesion of the MgO nanocrystallites and their soft plastic behavior under SPS conditions. The composite effect leads to significant modifications in both the dielectric properties and Curie–Weiss parameters compared to uncoated BaTiO3, especially a decrease and thermal stabilization of both the permittivity and the dielectric losses. We ascribe such changes to the stress generated during SPS through the extended interfaces between the two components.

Item Type:Article
Additional Information:Thanks to the Royal Society of Chemistry. The definitive version is available at http://pubs.rsc.org The original PDF of the article can be found at Journal of Materials Chemistry C website : http://pubs.rsc.org/en/Content/ArticleLanding/2014/TC/C3TC31990C#!divAbstract
HAL Id:hal-01130844
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 > Université de Bordeaux (FRANCE)
Laboratory name:
Funders:
Conseil Régional d'Aquitaine (France) - Agence nationale de la recherche (France)
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Deposited By: cirimat webmestre
Deposited On:12 Mar 2015 13:48

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