Ferroelectric hysteresis in simultaneously stretched and corona-poled PVDF films

Author

Bharti, V. ; Kaura, T. ; Nath, R.

Author_Institution

Dept. of Phys., Roorkee Univ., India

Volume

4

Issue

6

fYear

1997

fDate

12/1/1997 12:00:00 AM

Firstpage

738

Lastpage

741

Abstract

SSCP (simultaneous stretching and corona poling) of PVDF (polyvinylidene fluoride) films has enhanced the ferroelectric properties. D-E hysteresis loops of these films were observed by using the Sawyer-Tower method in the field range 35 to 80 MV/m. The dependence of ferroelectric hysteresis on poling field has also been studied. The average value of remanent polarization ≈82 mC/m² was observed for the SSCP (simultaneous stretching and corona poling) films, which is significantly higher than the value P≈62 mC/m² observed for the STCP (stretched and then corona poled) films. Coercive fields of E_c≈61 and 50 MV/m were obtained for the SSCP and the STCP films respectively. A comparison of the IR spectra of the SSCP and the STCP films in perpendicularly polarized light E_⊥ indicates that the dipolar orientation is better in the SSCP films

Keywords

dielectric hysteresis; ferroelectric thin films; infrared spectra; polymer films; IR spectra; PVDF film; SSCP; STCP; Sawyer-Tower method; coercive field; dipolar orientation; ferroelectric hysteresis; perpendicularly polarized light; polyvinylidene fluoride; remanent polarization; simultaneous stretching and corona poling; stretching and then corona poling; Capacitors; Corona; Crystallization; Ferroelectric films; Ferroelectric materials; Hysteresis; Infrared spectra; Optical polarization; Pyroelectricity; Temperature;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/94.654689

Filename

654689