Landau theory of phase transition in ferroelectric vinylidene fluoride/trifluoroethylene copolymer single crystals: Hysteresis loop

被引：0
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作者：
Iwata, Makoto [1 ]
Ishibashi, Yoshihiro [2 ]
机构：
[1] Department of Engineering Physics, Electronics and Mechanics, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
[2] Faculty of Business, Aichi Shukutoku University, Nagakute-cho, Aichi 480-1197, Japan
来源：
| 1600年 / Japan Society of Applied Physics卷 / 44期
关键词：
Coercive force - Copolymers - Ferroelectric materials - Fluoride minerals - Free energy - Hysteresis - Single crystals;
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摘要：
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 γ2. It was found that the coercive field strongly depends on the value of γ2. and decreases as γ2 = 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 γ2. © 2005 The Japan Society of Applied Physics.
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