| 梯度铁电薄膜性质研究 |
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| 引用本文： | 张芹,郭言利.梯度铁电薄膜性质研究[J].吉林林学院学报,2010(6):501-503. |
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| 作者姓名： | 张芹 郭言利 |
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| 作者单位： | 北华大学物理学院,吉林吉林132033 |
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| 基金项目： | 吉林省教育厅科研基金项目（200690）. |
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| 摘 要： | 以二级相变铁电材料为例,利用推广的Ginzburg-Landau-Devonshire（GLD）理论,研究不均匀结构对梯度铁电薄膜性质的影响.结果表明：退极化场对于两层薄膜中间的极化影响较小,而在薄膜的两端处影响最大;梯度铁电薄膜的平均极化随膜厚按线性规律变化;在接近相变温度时,自发极化消失,梯度铁电薄膜的这一现象与铁电材料的性质相同.在外场不等于零的情况下,得到的梯度铁电薄膜的电滞回线中心对称.
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| 关 键 词： | 梯度铁电薄膜 自发极化 GLD理论 自由能 铁电相变 |
On Properties about Gradient Ferroelectric Thin Film |
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| Authors: | ZHANG Qin GUO Yan-li |
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| Institution: | ( Physical College of Beihua University, Jilin 132033, China ) |
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| Abstract: | Using the generalized theory of Ginzburg-Landau-Devonshire, the influence of inhomogeneous structure on properties of gradient ferroelectric film is studied. We take the ferroeleetric material with the second order phase transition as an example to complete numerical calculation. Tile results showed that the influence of depolarization field on the middle of gradient ferroelectric film is larger than that toward each end. The average polarization of gradient ferroelectric film varys linearly with the thickness of film. When the reduced temperature is equal to 1 , spontaneous polarization vanishes. This phenomenon of gradient ferroelectrie film is identical with that of bulk ferroelectric material. When the external field is not equal to zero,electric hysteresis loop we obtained is centrosymmetry. |
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| Keywords: | gradient ferroelectrics thin film spontaneous polarization the theory of Ginzburg-Landau-Devonshire free energy ferroelectrics transition |
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