Title :
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
fDate :
12/1/1997 12:00:00 AM
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 Ec≈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;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
