Discharge of ferroelectrets upon ionizing alpha radiation
Sprache des Titels:
Ferroelectrets, with their internal bipolar charges on the surfaces of the voids can be viewed as a collection of a large number of individual tiny electret ionization chambers. Electrets in ionization chambers are discharged upon irradiation with ionizing radiation. The discharge of cellular propylene is studied upon irradiation with alpha-radiation from a 226Ra source, while in-situ measuring the piezoelectric effect. Piezoelectric coefficients are derived from piezoelectric thickness extension resonances and from the second harmonic current upon application of a sinusoidal voltage signal. The piezoelectric coefficient gives a direct measure of the effective internal surface charge density within the voids of the cellular material. Compared to electret ionizing chambers, a much better temporal stability of charges in ferroelectrets is observed. The small air volume in the voids of cellular polypropylene is believed to account for the remarkable charge stability.
Sprache der Kurzfassung:
IEEE Transactions on Dielectrics and Electrical Insulation