Dielectric Investigations of Relaxor Reduced Poly(Vinylidene Fluoride-Trifluoroethylene) Copolymer in DC Bias Electric Field

Abstract

Properties of newly-developed relaxor reduced poly(vinylidene fluoride-trifluoroethylene) copolymer have been investigated by measurements of temperature and frequency dependent dielectric response in dc bias electric field. It has been found that dc bias field effectively blocks the ac conductivity. The analysis of dielectric dynamics show that the Vogel-Fulcher parameters, obtained from either peaks in ϵ″(T) or frequency dependent dielectric data, are identical within experimental error. Furthermore, the decrease of Vogel-Fulcher temperature and increase of activation energy on increasing dc bias field suggest that the nonlinear dielectric susceptibility dominantly influences the relaxor dynamics in dc bias electric fields.

Acknowledgment

This research was supported by the Slovenian Research Agency under program P1-0125.