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- W1992188163 abstract "Changes in electric displacement vs. electric field (D–E) hysteresis characteristics during repeated polarization reversal were measured for melt-extruded 20-µm-thick films of a vinylidene fluoride (VDF)/trifluoroethylene (TrFE) copolymer with composition 75/25 mol%. The initial hysteresis loop with a sinusoidal electric field of amplitude E0=100 MV/m exhibited remanent polarization Pr=85 mC/m2 and coercive field Ec=50 MV/m. As the electric field was cycled, fatigue was observed as a reduction of Pr. Decreasing E0 accelerated the fatigue. After 105 cycling, Pr reduced to 58, 44 and 6 mC/m2 at E0=100, 80 and 60 MV/m, respectively. Laser-induced current measurements on fatigued samples revealed a development of nonuniform polarization distribution consisting of two opposing polarization layers directed from the electrode toward the inside. As fatigue progressed, the two layers tended to become equal in thickness, thus reducing the remanent polarization. We conclude that fatigue originates in the pinning of negative polarization charge to the electrodes on both surfaces, presumably due to annihilation of nucleation sites for polarization reversal in VDF/TrFE copolymer films." @default.
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- W1992188163 date "2002-06-15" @default.
- W1992188163 modified "2023-09-27" @default.
- W1992188163 title "Development of Polarization Distribution in Fatigued Films of Ferroelectric Vinylidene Fluoride/Trifluoroethylene Copolymer" @default.
- W1992188163 cites W105500543 @default.
- W1992188163 doi "https://doi.org/10.1143/jjap.41.3822" @default.
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