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Origin of colossal permittivity in BaTiO3 via broadband dielectric spectroscopy

Han, Hyuksu and Voisin, Christophe and Guillemet-Fritsch, Sophie and Dufour, Pascal and Tenailleau, Christophe and Turner, Christopher and Nino, Juan C. Origin of colossal permittivity in BaTiO3 via broadband dielectric spectroscopy. (2013) Journal of Applied Physics, 113 (2). 1-8. ISSN 0021-8979

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Official URL: http://dx.doi.org/10.1063/1.4774099

Abstract

Barium titanate (BT) ceramics with Ba/Ti ratios of 0.95 and 1.00 were synthesized using spark plasma sintering (SPS) technique. Dielectric spectroscopy (frequency range from 40 Hz to 1MHz and temperature range from 300K to 30K) was performed on those ceramics (SPS BT). SPS BT showed extremely high permittivity up to ~10⁵, can be referred to as colossal permittivity, with relatively low dielectric loss of ~0.05. Data analyses following Debye relaxation and universal dielectric response models indicate that the origin of colossal permittivity in BT ceramics is the result of a hopping polaron within semiconducting grains in combination with interfacial polarization at the insulating grain boundary. Furthermore, the contributions of each polarization mechanism to the colossal permittivity in SPS BT, such as a hopping polarization, internal barrier layer capacitance effect, and electrode effect, were estimated.

Item Type:Article
Additional Information:Thanks to American Institute of Physics editor. The definitive version is available at http://jap.aip.org The original PDF can be found at Journal of Applied Physics website: http://jap.aip.org/resource/1/japiau/v113/i2/p024102_s1
HAL Id:hal-00863352
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:18 Sep 2013 14:53

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