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The study of electrical properties of poly (ethylene terephthalate), (PET), has attracted great interest since it is used in commercial applications such as insulation in capacitors and as a charge storage device in foil electret transducers. For an accurate evaluation of its insulating and electret qualities the underlying physical mechanisms for charge transport have to be understood. Two processes...
The results presented in this paper reveal a number of interesting features of the poling of PVDF: Room-temperature poling yields, depending on the applied field, no polarization at all or a spatially uniform polarization. In contrast, poling at elevated temperatures yields generally a nonuniform polarization with the poled region located close to the positive electrode at low fields, but extending...
Surfaces of materials irradiated by an electron beam emit low-energy secondary electrons and backscattered primary electrons. The total emission yield. defined as the ratio of the number of emitted electrons to the number of incident electrons. increases with decreasing primary energy. At the second crossover point this ratio equals unity and with further decreasing energy the emission yield reaches...
In recent studies,1,2 switching characteristics of PVDF were investigated in the time domain by measuring charge and current responses to the stepwise application of electric fields in circuits with RC time constants smaller than 1 µS. Switching times for polarization reversal of 4 µS and larger were reported depending on the field strength and temperature.1,2 Similar shapes of current vs. time curves...
With the widespread use of dielectric materials in high-radiation environments the behavior of the radiation-induced conductivity of dielectrics has acquired considerable importance. Numerous authors have investigated the dielectric response to short, intense bursts of radiation. The long-time behavior of the induced conductivity of insulators determines the amount of charge build-up which has been...
Polymer films used in the space environment are frequently exposed to partially penetrating electrons and show therefore often long-lasting charge-trapping effects. The physical processes responsible for the charge buildup and decay can only be understood with an accurate knowledge of the spatial charge profiles within the dielectrics. While calculations of charge profiles in radiation-charged dielectrics...
The experimental evidence obtained by the combination of heat pulse and TSC techniques has provided a picture of the trap structure in PTFE. With the experimentally determined activation energies, a model has been formulated that accurately describes the TSC results. This model is based on trap controlled transport with the experimentally justified approximation that when a carrier escapes out of...
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