Some features of the electric relaxation in PVDF and PVDF-PZT composites

Author

Sergeeva, A.E. ; Fedosov, S.N. ; Pissis, P.

Author_Institution

Odessa Technol. Inst., Ukraine

fYear

1994

fDate

7-9 Sep 1994

Firstpage

748

Lastpage

753

Abstract

It is shown that relaxation of the residual polarization in PVDF can be caused by spontaneous switching of a portion of the polarized volume to its initial electric state. The phenomenon is observed as Barkhausen´s pulses. The duration of the pulse, the magnitude of a leap, and the switched volume per pulse are calculated. The current oscillations of infra-low frequency are also observed in partly poled samples, caused by a propagation of polarization waves (solitons) through the sample thickness. It is shown that relaxation of the unstable component of the residual polarization is responsible for the thermally stimulated currents in PVDF-PZT composites. The thermally stable one provides for the piezo- and pyroelectricity in the composite

Keywords

Barkhausen effect; dielectric polarisation; dielectric relaxation; filled polymers; lead compounds; piezoceramics; polymer films; pyroelectricity; solitons; thermally stimulated currents; Barkhausen´s pulses; PVDF; PVDF-PZT composites; PZT; PbZrO3TiO3; current oscillations; electric relaxation; partly poled samples; piezoelectricity; pyroelectricity; residual polarization; solitons; spontaneous switching; thermally stimulated currents; Conductivity; Crystallization; Ferroelectric materials; Frequency; Piezoelectric polarization; Pyroelectricity; Solitons; Temperature; Voltage; Volume relaxation;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1994. (ISE 8), 8th International Symposium on

Conference_Location

Paris

Print_ISBN

0-7803-1940-0

Type

conf

DOI

10.1109/ISE.1994.515222

Filename

515222