Title :
Thermally stimulated depolarization current in PVDF, P(VDF-TFE) and P(VDF-TrFE)
Author :
Xia, Zhongfu ; Fedosov, Sergei ; Sergeeva, Alexandra ; Zhang, Hongyan
Author_Institution :
Pohl Inst. of Solid State Phys., Tongji Univ., Shanghai, China
Abstract :
TSD currents are studied in short circuit (SC) and open circuit (OC) modes in differently poled PVDF, P(VBF-TFE) and P(VDF-TrFE). A new phenomenon is observed, namely a double inversion of the TSD current in the OC mode and appearance of two well structured peaks in the SC mode in poled samples stored for 14 months, indicating that two different kinds of polarization exist in ferroelectric polymers, both accompanied by deeply trapped charge. The more stable component of polarization has presumably a ferroelectric nature, while the less stable one is attributed to polarization in amorphous phase. It is shown that very slow processes of space charge redistribution take place in ferroelectric polymers until the quasi-stationary state is readied
Keywords :
dielectric polarisation; electrets; ferroelectric materials; polymer films; space charge; thermally stimulated currents; P(VDF-TFE); P(VDF-TrFE); PVDF; amorphous phase; ferroelectric polymer; open circuit mode; polarization; quasi-stationary state; short circuit mode; space charge redistribution; thermally stimulated depolarization current; trapped charge; Amorphous materials; Circuits; Corona; Electrets; Ferroelectric materials; Glass; Polarization; Polymers; Space charge; Temperature;
Conference_Titel :
Electrets, 1996. (ISE 9), 9th International Symposium on
Conference_Location :
Shanghai
Print_ISBN :
0-7803-2695-4
DOI :
10.1109/ISE.1996.578230
