Title :
Changes in photo-induced pyroelectric transients during polarization reversal in VDF-TrFE copolymers
Author :
Sakai, Shigeru ; Ishida, Motohisa ; Date, Munehiro ; Furukawa, Takeo
Author_Institution :
Nippon Electron. Coll., Tokyo, Japan
Abstract :
The pyroelectric current transient induced by laser irradiation was measured for VDF/TrFE (vinylidene fluoride-trifluoroethylene) copolymers in order to examine the polarization distribution in the thickness direction developed during ferroelectric polarization reversal. It is found that the polarization profile is uniform for the case of relatively fast switching. On the other hand, the slow switching process develops nonuniform polarization profiles, suggesting that polarization reversal progress from the positively biased side
Keywords :
dielectric polarisation; electrets; ferroelectric transitions; polymer blends; pyroelectricity; VDF-TrFE copolymers; electret; fast switching; ferroelectric polarization reversal; laser irradiation; photo-induced pyroelectric transients; polarization distribution; polarization reversal; slow switching; thickness direction; vinylidene fluoride-trifluoroethylene; Chemical lasers; Current measurement; Ferroelectric materials; Hysteresis; Laser beams; Polarization; Pulse modulation; Pulsed laser deposition; Pyroelectricity; Semiconductor lasers;
Conference_Titel :
Electrets, 1991. (ISE 7) Proceedings., 7th International Symposium on (Cat. No.91CH3029-6)
Conference_Location :
Berlin
Print_ISBN :
0-7803-0112-9
DOI :
10.1109/ISE.1991.167258
