Volume 20, Issue 5, 2011

LETTER: STUDY ON THE DIELECTRIC BEHAVIOUR OF EPOXY/HAFNIUM OXIDE NANOPOWDER COMPOSITES

S.N. Georga

Department of Physics, University of Patras, GR-26504 Rion-Patras, Greece
e-mail:sgeorga@physics.upatras.gr

Received 25 August 2011; accepted 13 October 2011

ABSTRACT

The dielectric response of 10 and 15phr epoxy/HfO₂ nanocomposite systems has been studied in a wide frequency and temperature range. The experimental results show an enhancement of the dielectric permittivity with increasing filler concentration. The dielectric spectra reveal the presence of α-relaxation and a weak MWS effect. In the high frequency range the real part of the electrical conductivity obeys the Universal Dielectric Response (UDR), whereas at low frequencies and high temperatures DC conductivity is observed. VFT (Vogel-Fulcher-Tamann) parameters are calculated for all measured specimens.