DocumentCode :
639705
Title :
Are cellular polypropylene ferroelectrets ferroic?
Author :
Xunlin Qiu ; Wirges, Werner ; Gerhard, Reimund ; Cury Basso, Heitor
Author_Institution :
Dept. of Phys. & Astron., Univ. of Potsdam, Potsdam, Germany
fYear :
2013
fDate :
June 30 2013-July 4 2013
Firstpage :
952
Lastpage :
955
Abstract :
Non-polar polymer foams can be rendered piezoelectric by internal charging of their cavities through a series of dielectric barrier discharges (DBDs). The cavities with their positive and negative charges are man-made macroscopic dipoles that function in analogy to the dipoles in ferroelectrics and that also constitute a macroscopic electric polarization. In ferroelectric materials, polarization-versus-electric-field (P(E)) hysteresis curves are observed. Here, P(E) hysteresis curves are obtained on cellular polypropylene ferroelectrets by means of voltage-voltage-mode measurements. The charge transferred during the internal DBD charging is determined from the voltage on a standard capacitor that is connected in series with the sample and that has a much larger capacitance than the sample. Another standard capacitor, with a capacitance much smaller than that of the former, but still substantially larger than that of the sample, is also connected in series and serves as a high-voltage divider that protects the electrometer in case of destructive breakdown in the sample. It will be shown how the DBDs inside the cellular foam lead to a phenomenological hysteresis curve that is the same as the hysteresis loops found in other ferroic materials.
Keywords :
capacitance; dielectric hysteresis; dielectric polarisation; discharges (electric); electrets; electrometers; ferroelectric materials; polymer foams; cellular polypropylene ferroelectrets; destructive breakdown; dielectric barrier discharges; electrometer; ferroics; high-voltage divider; internal DBD charging; macroscopic electric polarization; man-made macroscopic dipoles; negative charges; nonpolar polymer foams; phenomenological hysteresis curve; piezoelectricity; polarization-versus-electric-field hysteresis curves; positive charges; voltage-voltage-mode measurements; Capacitance; Capacitors; Cavity resonators; Charge measurement; Hysteresis; Standards; Voltage measurement;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Solid Dielectrics (ICSD), 2013 IEEE International Conference on
Conference_Location :
Bologna
ISSN :
2159-1687
Print_ISBN :
978-1-4799-0807-3
Type :
conf
DOI :
10.1109/ICSD.2013.6619905
Filename :
6619905
Link To Document :
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