https://doi.org/10.1140/epjb/e2015-60510-x
Regular Article
Dielectric relaxation and charge transfer mechanism in the composite material of nanoparticles BaTiO3 with a modified surface in polystyrene*
1 Department of Physics and
Nanotechnology, Kursk State University, Radishcheva st., 33, 305000
Kursk,
Russia
2 Department of Theoretical Physics,
Kursk State University, Radishcheva
st., 33, 305000
Kursk,
Russia
3 Department of Chemistry, Kursk State
University, Radishcheva st.,
33, 305000
Kursk,
Russia
4 Region Centre of Nanotechnology,
Southwest State University, 50 let
Oktyabrya st. 94, 305040
Kursk,
Russia
5 Department of Solid State Physics,
Voronezh State Technical University, Moskovsky pr. 14, 394026
Voronezh,
Russia
a
e-mail: nikitaemelyanov@bk.ru
Received:
27
June
2015
Received in final form:
26
August
2015
Published online:
9
November
2015
We present the results of investigations related to the dielectric relaxation process in the composite material of BaTiO3 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.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2015