Electrostriction and Piezoelectricity in Ferroelectric Polymers

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Abstract
The effect of electrostriction on piezoelectric activity has been investigated in a ferroelectric copolymer of vinylidene fluoride and trifluoroethylene with a composition of 52/48 mol%. The electrostriction constants determined from changes in lattice spacing and the spontaneous polarization associated with a ferroelectric-to-paraelectric transition induce piezoelectric activities, positive d 31 and negative d 32. The combined contributions from the dimensional effect and the electrostrictire coupling are consistent with the magnitude and anisotropy of observed piezoelectric constants.