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

fYear

1996

fDate

25-30 Sep 1996

Firstpage

902

Lastpage

907

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1996. (ISE 9), 9th International Symposium on

Conference_Location

Shanghai

Print_ISBN

0-7803-2695-4

Type

conf

DOI

10.1109/ISE.1996.578230

Filename

578230