Abstract
AbstractFerroelectric polarization‐reversal switching of vinylidene fluoride—trifluoroethylene copolymer with 73 mol % of vinylidene fluoride is investigated under a variety of conditions in an attempt to derive detailed information on the polarization reversal of the polymer. The electric‐field dependence of switching time ts obeys an exponential law. The temporal change of switching current density J is presented in the form J/(Ps − P) versus time (P is the polarization, and Ps is its saturation value), which is free of the depolarization‐field effect and discriminates in a straightforward manner between acceleration and deceleration of switching. Effects of the annealing of samples upon ts are observed together with changes in the degree of crystallinity. Effects of space charge distribution upon ts are investigated by applying two successive pulses, positive and negative, with varied intervals tw between the two. The dynamics of space charge redistribution is elucidated from the tw dependence of the ts of the second pulse. The temperature dependence of ts indicates that the switching becomes critically fast as the phase‐transition temperature is approached.
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