Development of Polarization Distribution in Fatigued Films of Ferroelectric Vinylidene Fluoride/Trifluoroethylene Copolymer(Electrical Properties of Condensed Matter)

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概要

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• 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 E_0=lOOMV/m exhibited remanent polarization P_r=85mC/m^2 and coercive field E_c=50MV/m. As the electric field was cycled, fatigue was observed as a reduction of P_r. Decreasing E_0 accelerated the fatigue. After 10^5 cycling, P_r reduced to 58, 44 and 6mC/m^2 at E_0=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.

• 社団法人応用物理学会の論文
• 2002-06-15

著者

• Date Munehiro

  Department Of Applied Chemistry Tokyo Institute Of Polytechnics

• Date Munehiro

  Department Of Chemistry Faculty Of Science Science University Of Tokyo:(permanent Address)kobayashi

• Sakai Shigeru

  Department Of Chemistry Faculty Of Science Science University Of Tokyo

• Furukawa Takeo

  Department Of Chemistry Faculty Of Science Science University Of Tokyo

• Sasaki Shigeru

  Department Of Animal Science Faculty Of Agriculture Hokkaido University

• Furukawa Takeo

  Department of Chemistry, Faculty of Science, Science University of Tokyo

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