Dielectric relaxation and charge transfer mechanism in the composite material of nanoparticles BaTiO 3 with a modified surface in polystyrene

Nikita Emelianov (), Eugene Postnikov, Oleg Yacovlev, Alexey Chaplygin, Alexander Chekadanov and Wisam Al Mandalavi

The European Physical Journal B: Condensed Matter and Complex Systems, 2015, vol. 88, issue 11, 1-4

Abstract: We present the results of investigations related to the dielectric relaxation process in the composite material of BaTiO 3 nanoparticles with the surface modified by hydroxyl groups and sodium oleate in polystyrene for the frequency range 1–140 kHz. The dispersion of the dielectric permittivity in the composite material with the volume fraction 5–35% is detected due to the presence of the relaxation process resulted in a blurred spectrum of relaxation times. It is found that the presence of surface’s modification leads to two effects related to the ac conductivity: a saturation of the frequency dependence and the further drastic growth, which may correspond to the specific hopping mechanism. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2015

Date: 2015
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DOI: 10.1140/epjb/e2015-60510-x

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