Nanosecond Switching Characteristics of Ferroelectric Ultrathin Vinylidene Fluoride/Trifluoroethylene Copolymer Films under Extremely High Electric Field

2009 ◽  
Vol 48 (9) ◽  
pp. 09KE04 ◽  
Author(s):  
Takashi Nakajima ◽  
Yoshiyuki Takahashi ◽  
Soichiro Okamura ◽  
Takeo Furukawa
Keyword(s):  
Electric Field ◽  
Vinylidene Fluoride ◽  
High Electric Field ◽  
Copolymer Films ◽  
Switching Characteristics

Rotation of polar axis of β-form poly(vinylidene fluoride) under high electric field

1984 ◽  
Vol 57 (1) ◽  
pp. 139-149 ◽  
Author(s):  
Ken'ichi Nakamura ◽  
Yoshikichi Teramoto ◽  
Naohiro Murayama
Keyword(s):  
Electric Field ◽  
Vinylidene Fluoride ◽  
Polar Axis ◽  
High Electric Field ◽  
Poly Vinylidene Fluoride

scholarly journals Influence of Different Solvents and High-Electric-Field Cycling on Morphology and Ferroelectric Behavior of Poly(Vinylidene Fluoride-Hexafluoropropylene) Films

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3884
Author(s):  
Till Mälzer ◽  
Lena Mathies ◽  
Tino Band ◽  
Robert Gorgas ◽  
Hartmut S. Leipner
Keyword(s):  
Phase Composition ◽  
Electric Field ◽  
Surface Structure ◽  
Electric Fields ◽  
Vinylidene Fluoride ◽  
High Electric Field ◽  
Crystal Phase ◽  
Shielding Effect ◽  
Ferroelectric Behavior ◽  
Field Cycling

P(VdF-HFP) films are fabricated via a solution casting doctor blade method using high (HVS) and low (LVS) volatile solvents, respectively. The structural properties and the ferroelectric behavior are investigated. The surface structure and crystal phase composition are found to be strongly dependent on the type of solvent. LVS leads to a rougher copolymer surface structure with large spherulites and a lower crystallinity in contrast with HVS. The crystalline phase of copolymer films fabricated with HVS consists almost exclusively of α-phase domains, whereas films from LVS solution show a large proportion of γ-phase domains, as concluded from Raman and X-ray diffraction spectra. Virgin films show no ferroelectric (FE) switching polarization at electric field amplitudes below 180 MV/m, independent of the solvent type, observed in bipolar dielectric displacement—electric field measurements. After applying electric fields of above 180 MV/m, a FE behavior emerges, which is significantly stronger for LVS films. In a repeated measurement, FE polarization switching already occurs at lower fields. A shielding effect may be related to this observation. Additionally, Raman bands of polar γ-phase increase by high-electric-field cycling for the LVS sample. The solvent used and the resulting crystal phase composition of the virgin sample is crucial for the copolymer behavior during bipolar electrical cycling.

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