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首页> 外文期刊>Journal of Applied Physics >Structural characteristics of ferroelectric phase transformations in single-domain epitaxial films
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Structural characteristics of ferroelectric phase transformations in single-domain epitaxial films

机译：单畴外延膜中铁电相变的结构特征

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摘要

Structural characteristics of phase transformations in epitaxial ferroelectric films are analyzed via a Landau-Devonshire thermodynamic formalism. It is shown that the phase transformation temperature, the lattice parameters, and the order of the phase transformation are a strong function of the misfit strain and are considerably different compared to unconstrained, unstressed single crystals of the same composition. Depending on the internal stress state, it is possible that the structural aspects of the paraelectric-ferroelectric phase transformation may be completely obscured in the presence of epitaxial strains. The thickness dependence of epitaxial stresses due to relaxation by misfit dislocations during film deposition is incorporated into the model using an "effective" substrate lattice parameter. There is a good quantitative agreement between the theoretical analysis and experimental observations reported in the literature on the variations in the lattice parameters and the phase transformation temperature with film thickness in epitaxial BaTiO_(3) films.
机译：通过Landau-Devonshire热力学形式论分析了外延铁电薄膜中相变的结构特征。结果表明，相变温度，晶格参数和相变顺序是失配应变的重要函数，并且与相同组成的无约束，无应力单晶相比，相差很大。取决于内部应力状态，在外延应变的存在下，顺电-铁电相变的结构方面可能被完全遮盖。使用“有效”衬底晶格参数将由于膜沉积过程中因失配位错而松弛引起的外延应力的厚度依赖性纳入模型。外延BaTiO_（3）薄膜中晶格参数和相变温度随薄膜厚度的变化，理论分析与文献报道的实验观察之间存在良好的定量一致性。

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  • 来源
    《Journal of Applied Physics》 |2004年第12期|p.8118-8123|共6页
  • 作者

    S. P. Alpay; I. B. Misirlioglu; A. Sharma; Z.-G. Ban;

  • 作者单位

    Department of Metallurgy and Materials Engineering and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用物理学;
  • 关键词

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