Title :
Inverse piezoelectricity of porous PTFE films with bipolar space charge
Author :
Gerhard-Multhaupt, R. ; Wegener, M. ; Künstler, W. ; Wirges, W. ; Görne, T. ; Urayama, K. ; Neher, D.
Author_Institution :
Dept. of Phys., Univ. of Potsdam, Germany
Abstract :
After suitable charging at room or elevated temperatures, porous films of polytetrafluoroethylene (PTFE) exhibit direct as well as inverse piezoelectricity. For the present study, the inverse piezoelectric responses of charged porous PTFE films are measured by means of an interferometric technique as well as an acoustic method. In addition to materials issues such as sample and electrode preparation as well as electret charging, the two methods are briefly described and the respective results obtained with them are discussed in comparison to each other
Keywords :
electrets; electrostriction; piezoelectric thin films; polymer films; porous materials; space charge; acoustic method; bipolar space charge; charged films; electret charging; electroacoustic measurement; electrostriction; interferometric technique; inverse piezoelectricity; porous PTFE films; thickness changes; Electrets; Electrodes; Microscopy; Optical films; Optical scattering; Piezoelectric films; Piezoelectric transducers; Piezoelectricity; Polymers; Space charge;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 2000 Annual Report Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-6413-9
DOI :
10.1109/CEIDP.2000.885304
