Berlin 2015 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 6: Poster Session DF

DF 6.8: Poster

Montag, 16. März 2015, 19:00–21:00, Poster C

Influence of charging temperature on the hysteresis behavior of tubular-channel fluoroethylenepropylene (FEP) ferroelectrets — •Markus Steffen, Xunlin Qiu, Werner Wirges, and Reimund Gerhard — Applied Condensed-Matter Physics,University of Potsdam

Ferroelectrets are internally charged polymer foams or polymer systems with internal cavities which exhibit strong piezoelectricity after bipolar charging (poling) [1].The gas-filled cavities can be charged via a series of dielectric barrier discharges (DBDs). During the DBDs, charges of both polarities are separated, and then deposited onto the internal top and bottom surfaces of the cavities, respectively. The internally charged cavities can be regarded as macroscopic dipoles, whose direction can be switched by reversing the applied electric field. Thus, DBDs inside the cavities lead to a phenomenological hysteresis behavior similar to that of other ferroic materials [2]. In the present study, the influence of the charging temperature on the hysteresis loops of tubular-channel fluoroethylenepropylene (FEP) ferroelectrets is systematically studied over a wide temperature range from −100 to 150^∘C. The coercive field and the remanent polarization of the ferroelectret samples are determined as functions of the charging temperature. The results are discussed in the light of Paschen’s law for electric breakdown by taking into account the respective gas temperature.