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High-frequency dielectric spectroscopy of batio3 core - silica shell nanocomposites: Problem of interdiffusion

Nuzhnyy, Dmitry and Petzelt, Jan and Bovtun, Viktor and Kempa, Martin and Savinov, Maxim and Elissalde, Catherine and Chung, U-Chan and Michau, Dominique and Maglione, Mario and Estournès, Claude High-frequency dielectric spectroscopy of batio3 core - silica shell nanocomposites: Problem of interdiffusion. (2011) Journal of Advanced Dielectrics, vol. 1 . pp. 309-317. ISSN 2010-135X

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Official URL: http://dx.doi.org/10.1142/S2010135X11000367

Abstract

Three types of BaTiO3 core - amorphous nano-shell composite ceramics were processed from the same core-shell powder by standard sintering, spark-plasma sintering and two-step sintering techniques and characterized by XRD, HRSEM and broad-band dielectric spectroscopy in the frequency range 10^3 - 10^13 Hz including the THz and IR range. The samples differed by porosity and by the amount of interdiffusion from the cores to shells, in correlation with their increasing porosity. The dielectric spectra were also calculated using suitable models based on effective medium approximation. The measurements revealed a strong dielectric dispersion below the THz range, which cannot be explained by the modeling, and whose strength was in correlation with the degree of interdiffusion. We assigned it to an effect of the interdiffusion layers, giving rise to a strong interfacial polarization. It appears that the high-frequency dielectric spectroscopy is an extremely sensitive tool for detection of any gradient layers and sample inhomogeneities even in dielectric materials with negligible conductivity.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Academy of Sciences (CZECH REPUBLIC)
French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Université de Bordeaux 1 (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Laboratory name:
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Deposited By: Denis Faragou
Deposited On:06 Jul 2012 12:26

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