Discharge of Ferroelectrets upon Ionizing Alpha-radiation

作者：Dansachmueller Mario; Minev Ivan R; Schwoediauer Reinhard; Bauer Gogonea Simona; Bauer Siegfried

来源：IEEE Transactions on Dielectrics and Electrical Insulation, 2011, 18(1): 64-68.

DOI：10.1109/TDEI.2011.5704494

• Cellular polypropylene
• ferroelectrets
• piezoelectricity
• dielectric radiation effects

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 Ra-226 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.

• 出版日期2011-2