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Colossal Permittivity in Ultrafine Grain Size BaTiO3–x and Ba0.95La0.05TiO3–x Materials

Guillemet, Sophie and Valdez Nava, Zarel and Tenailleau, Christophe and Lebey, Thierry and Durand, Bernard and Chane-Ching, Jean-Yves Colossal Permittivity in Ultrafine Grain Size BaTiO3–x and Ba0.95La0.05TiO3–x Materials. (2008) Advanced Materials, 20 (3). 551-555. ISSN 0935-9648

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Official URL: http://dx.doi.org/10.1002/adma.200700245


Development of microelectronic devices is driven by a large demand for faster and smaller systems. In the near future, colossal permittivity in nanomaterials will play a key role in the advances of electronic devices. We report on “colossal” permittivity values achieved in dense ceramics displaying ultrafine grain size ranging from 70 nm to 300 nm. Relative permittivity values of ∼ 106 at 1 kHz (0.1 < tand < 0.7) were obtained for Ba0.95La0.05TiO3–x ceramics. The colossal effective permittivity is related to an interfacial polarization and is achieved in nanomaterials by the activation of a high number of carriers and their trapping at the interfaces. Polarization carriers involving Ti3+ polaron is proposed to be at the origin of the observed colossal permittivity. These results may have an important technological impact since these ceramics display ultrafine grain size opening a new route to the fabrication of very thin dielectric films.

Item Type:Article
Additional Information:Thanks to John Wiley & Sons editor. The definitive version is available at http://www3.interscience.wiley.com The original PDF of the article can be found at Advanced Materials website : http://www3.interscience.wiley.com/journal/10008336/home
HAL Id:hal-03578123
Audience (journal):International peer-reviewed journal
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Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
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Deposited On:04 Jun 2009 09:27

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