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Dielectric properties of colossal permittivity materials: An update

Cheballah, Chafe and Valdez-Nava, Zarel and Laudebat, Lionel and Lebey, Thierry and Bidan, Pierre and Diaham, Sombel and Guillemet-Fritsch, Sophie Dielectric properties of colossal permittivity materials: An update. (2013) Journal of Energy and Power Engineering, 7 (4). 726-732. ISSN 1934-8975

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Abstract

During the last 10 years, a lot of interests have been devoted to the so-called CDC (colossal dielectric constant) materials. The first materials exhibiting this behavior were the perovskite-based ceramics on the CCTO (CaCu3Ti4O12) composition. Relative dielectric permittivity can attain values up to (or even larger than) 105. Nevertheless, their dielectric losses are too high, the lower values ranging 10%, in a narrow frequency range, thus limiting their applications. The underlying physical mechanisms at the origin of the CDC are still under study. The analysis of broadband impedance spectroscopy measurements leads most of the authors to propose an interfacial polarization mechanism (at the electrodes or at internal barriers), there is a limited number of complementary electrical characterization techniques, which, up to now, comfort the proposed interfacial polarization mechanisms. In the present work, I-V and time-domain polarization are used to characterize these materials. One of the main results is the observation of a non-symmetrical response of these materials related to the direction of the polarization. These results are observed for both macroscopic level on bulk polycrystalline material and within individual grains of the same samples. These results do not fit current accepted models for polarization for CDC materials.

Item Type:Article
Additional Information:Thanks to David Publishing editor. The original PDF of the article can be found at Journal of Energy and Power Engineering website : http://www.sciencedirect.com/science/journal/00406031
HAL Id:hal-01169490
Audience (journal):International peer-reviewed journal
Audience (conference):International conference proceedings
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 > Institut National Universitaire Champollion - INU (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:29 Jun 2015 13:07

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