Dielectric spectroscopy on ferroelectric P(VDF-TrFE)

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Abstract
The complex dielectric function ϵ(f, T) of 70/30 P(VDF-TrFE) has been measured in the frequency range from f = 10mHz to 10MHz and over the temperature range from T = −50°C to 130°C. The measured frequency spectra at each temperature are dominated by three relaxation processes. The characteristic relaxation frequencies increase with increasing temperature. The high frequent of the observed relaxation processes is associated with the ferroelectric properties of the material. Heating and cooling cycles showed a distinct thermal hysteresis of the dielectric function in the vicinity of the Curie temperature.