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Piezoelectric properties of 0-3 ceramic/polar polymer composites

Published online by Cambridge University Press:  15 February 2011

C. Dias  and
D. K. Das-Gupta
C. Dias
Affiliation:
School of Electronic Engineering Science, University College of North Wales, Dean Street, Bangor, Gwynedd LL57 1UT, UK
D. K. Das-Gupta
Affiliation:
School of Electronic Engineering Science, University College of North Wales, Dean Street, Bangor, Gwynedd LL57 1UT, UK
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Abstract

Ferroelectric ceramics such as PZT, while exhibiting strong piezoelectric effect, have the disadvantages of a high acoustic impedance, difficulty to miniaturize and not being suitable to broad band ultrasonic applications. Polar ferroelectric polymer such as PVDF and its copolymers which can be obtained in thin film form, have low mechanical Q and low acoustical impedance although their piezoelectric coefficients are significantly lower than those of the piezoelectric ceramics. Composites of piezoelectric ceramic powders, such as PZT and Calcium modified Lead Titanate (PT) in a matrix of P(VDF/TrFE) have been fabricated in our laboratory, in order to Investigate whether these materials could have the low acoustic, broad band properties of the polymers whilst retaining the high piezoelectric coefficients of the ceramics. In the present paper the results of a study of the electromechanical coupling factor (kt), the quality factor (Qm) as well as the gh and dh piezoelectric coefficients of these 0-3 composites poled both by corona and by the conventional method are given.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 276: Symposia U/Y – Smart Materials Fabrication and Materials for Micro-Electro-Mechanical Systems , 1992 , 25
Copyright
Copyright © Materials Research Society 1992

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References

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