Abstract

TSD currents are studied in short circuit (SC) and open circuit (OC) modes in differently poled PVDF, P(VBF-TFE) and P(VDF-TrFE). A new phenomenon is observed, namely a double inversion of the TSD current in the OC mode and appearance of two well structured peaks in the SC mode in poled samples stored for 14 months, indicating that two different kinds of polarization exist in ferroelectric polymers, both accompanied by deeply trapped charge. The more stable component of polarization has presumably a ferroelectric nature, while the less stable one is attributed to polarization in amorphous phase. It is shown that very slow processes of space charge redistribution take place in ferroelectric polymers until the quasi-stationary state is readied.

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