Abstract
Dielectric nonlinearities in a poled copolymer of vinylidene fluoride and trifluoroethylene (65/35 mol ratio) are discussed in terms of first and second order dielectric constants measured under bias electric fields Eb with an inverse direction to spontaneous polarization. Variation in phase transition temperature Tc obeys the Clausius-Clapeyron equation in a certain range of Eb. Under Eb beyond a certain range, however, Tc deviates from the linear Tc-Eb relation which is described by the Clausius-Clapeyron equation. It is concluded from the observation of the second order dielectric constant that the reason of the deviation is that the polarization reversal occurs before the phase transition.
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Ikeda, S., Suzuki, H. Correlation between Ferroelectric Phase Transition and Polarization Reversal Phenomena Observed through Nonlinear Dielectric Anomaly in Ferroelectric Fluorocopolymers. Polym J 24, 1223–1227 (1992). https://doi.org/10.1295/polymj.24.1223
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DOI: https://doi.org/10.1295/polymj.24.1223