Landau Theory of Phase Transition in Ferroelectric Vinylidene Fluoride/Trifluoroethylene Copolymer Single Crystals: Hysteresis Loop

概要

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Ferroelectric hysteresis loops in vinylidene fluoride/trifluoroethylene, P[VDF/TrFE], copolymer single crystals are discussed on the basis of the Landau-type free energy function with the anisotropy parameter $\gamma_{2}$. It was found that the coercive field strongly depends on the value of $\gamma_{2}$, and decreases as $\gamma_{2}=0$ is approached, because the Landau-type free energy function becomes isotropic in the order parameter space. We successfully reproduced the $ p$–$E$ hysteresis loop with a square shape and a small coercive field in P[VDF/TrFE] on the basis of the Landau theory with the anisotropy parameter $\gamma_{2}$.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2005-09-15