TY - JOUR
T1 - In-situ acoustical investigation of the polarization build-up in cellular polypropylene ferroelectrets
AU - Qiu, Xunlin
AU - Gerhard, Reimund
AU - Mellinger, Axel
N1 - Funding Information:
We are indebted to Dr. Steffen Bergweiler, to Dr. Guggi Kofod and to Werner Wirges (all University of Potsdam) for many stimulating discussions. The first author (X. Q.) acknowledges a Research Fellowship provided by the Deutsche Forschungsgemeinschaft (DFG, Reference no. Qi 65/1-1).
PY - 2010/8
Y1 - 2010/8
N2 - The build-up of the effective polarization in ferroelectrets under suitable voltage waveforms was studied by means of acoustical measurements and dielectric resonance spectroscopy. The radiated sound from ferroelectrets under external voltage signals has contributions not only from the effective charge density, but also from the Maxwell stress. Therefore, a "butterfly" curve was obtained for the received microphone signal during charging of a ferroelectret under linearly increasing or decreasing voltages. The microphone-signal measurements were converted to piezoelectric d33 coefficients by comparing the zero-charging-field microphone signals with the absolute d33 values determined by means of dielectric resonance spectroscopy immediately after charging. A polarization-voltage (P-V) hysteresis loop was obtained by analyzing the data in the light of an existing model for the piezoelectric d33 coefficient of ferroelectrets.
AB - The build-up of the effective polarization in ferroelectrets under suitable voltage waveforms was studied by means of acoustical measurements and dielectric resonance spectroscopy. The radiated sound from ferroelectrets under external voltage signals has contributions not only from the effective charge density, but also from the Maxwell stress. Therefore, a "butterfly" curve was obtained for the received microphone signal during charging of a ferroelectret under linearly increasing or decreasing voltages. The microphone-signal measurements were converted to piezoelectric d33 coefficients by comparing the zero-charging-field microphone signals with the absolute d33 values determined by means of dielectric resonance spectroscopy immediately after charging. A polarization-voltage (P-V) hysteresis loop was obtained by analyzing the data in the light of an existing model for the piezoelectric d33 coefficient of ferroelectrets.
KW - Ferroelectret
KW - Piezoelectricity
KW - acoustical investigation
KW - effective polarization
UR - http://www.scopus.com/inward/record.url?scp=77955579967&partnerID=8YFLogxK
U2 - 10.1109/TDEI.2010.5539673
DO - 10.1109/TDEI.2010.5539673
M3 - Article
AN - SCOPUS:77955579967
SN - 1070-9878
VL - 17
SP - 1043
EP - 1049
JO - IEEE Transactions on Dielectrics and Electrical Insulation
JF - IEEE Transactions on Dielectrics and Electrical Insulation
IS - 4
M1 - 5539673
ER -