Volume 20, Issue 5, 2011
LETTER: STUDY ON THE DIELECTRIC BEHAVIOUR OF EPOXY/HAFNIUM OXIDE NANOPOWDER COMPOSITES
Department of Physics, University of Patras, GR-26504 Rion-Patras, Greece
Received 25 August 2011; accepted 13 October 2011
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.