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首页> 外文期刊>Physica status solidi, B. Basic research >A study of flexoelectric coupling associated internal electric field and stress in thin film ferroelectrics
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A study of flexoelectric coupling associated internal electric field and stress in thin film ferroelectrics

机译：薄膜铁电体中柔电耦合相关内部电场与应力的研究

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By discussions in the framework of tensor representations and phenomenological theory, general piezoelectricity equations that incorporate direct and inverse flexoelectric effects were analyzed and interlink between direct and inverse flexoelectricity discovered. Due to flexoetectric coupling, mechanical strain gradient is equivalent to internal electric field. In ferroelectrics above the Curie temperature, it was shown theoretically that strain gradient associated electric field leads to non-zero polarization without external electric field, It was also shown theoretically that polarization (or electric field) gradient is an extra source of internal stress. Magnitudes of flexoelectricity associated internal electric field and stress were analyzed for heteroepitaxial thin films of barium strontium titanate. Flexoelectric coupling is expected to intensify with reducing lateral dimensions and thickness and get large enough at nanoscale to modify ferroelectric phase transitions and functional response. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
机译：通过在张量表示法和现象学理论的框架内进行讨论，分析了包含正反电动势的一般压电方程，并发现了正反电动势之间的相互联系。由于柔相耦合，机械应变梯度等于内部电场。在居里温度以上的铁电体中，从理论上证明，与梯度梯度相关的电场会导致没有外部电场的非零极化;从理论上也表明，极化（或电场）梯度是内部应力的额外来源。分析了钛酸钡锶异质外延薄膜的与内部电场和应力相关的挠曲强度。柔电耦合有望随着横向尺寸和厚度的减小而增强，并在纳米级变得足够大，以改变铁电相变和功能响应。 （C）2008 WILEY-VCH Verlag GmbH＆Co. KGaA，Weinheim。

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