Frequency dispersion and field dependence in the material constants of PVDF-TrFE copolymers in the thickness mode

Author

Sherrit, S. ; Haysom, J.E. ; Wiederick, H.D. ; Mukherjee, B.K. ; Sayer, M.

Author_Institution

Dept. of Phys., R. Mil. Coll. of Canada, Kingston, Ont., Canada

Volume

2

fYear

1996

fDate

18-21 Aug 1996

Firstpage

959

Abstract

A set of thickness resonators of PVDF-TrFE copolymer have been characterized as a function of the frequency and DC bias. The first six resonance peaks in the impedance spectra were analyzed to determine the degree of frequency dispersion in the complex elastic, piezoelectric, and dielectric constants. Modeling the dispersion in the material constants as a polynomial in the frequency f produced an excellent fit to the data over the 1-30 MHz frequency range. The samples were then tested for non-linearity by analyzing the fundamental resonance as a function of a DC bias field. The field dependence of the PVDF-TrFE samples was much smaller than for comparable samples of a soft PZT

Keywords

acoustic impedance; acoustic resonance; crystal resonators; elastic constants; nonlinear acoustics; permittivity; piezoelectric materials; piezoelectric transducers; polymer blends; polynomials; ultrasonic transducers; 1 to 30 MHz; DC bias; PVDF-TrFE copolymers; complex elastic constants; dielectric constants; field dependence; frequency dispersion; fundamental resonance; impedance spectra; material constants; nonlinearity; piezoelectric constants; polynomial; resonance peaks; thickness mode; thickness resonators; vinylidene fluoride trifluoroethylene copolymer; Contact resistance; Electrodes; Equations; Frequency; Immune system; Impedance; Optical materials; Optical resonators; Physics; Resonance;

fLanguage

English

Publisher

ieee

Conference_Titel

Applications of Ferroelectrics, 1996. ISAF '96., Proceedings of the Tenth IEEE International Symposium on

Conference_Location

East Brunswick, NJ

Print_ISBN

0-7803-3355-1

Type

conf

DOI

10.1109/ISAF.1996.598186

Filename

598186