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首页> 外文会议>Proceedings vol.2003-29; Epitaxial Growth of Functional Oxides Symposium and Electrochemical Society Meeting; 20031012-17; Orlando,FL(US) >EFFECT OF INTERNAL STRESSES ON THE PHASE TRANSFORMATION CHARACTERISTICS AND PHYSICAL PROPERTIES OF EPITAXIAL FERROELECTRIC FILMS
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EFFECT OF INTERNAL STRESSES ON THE PHASE TRANSFORMATION CHARACTERISTICS AND PHYSICAL PROPERTIES OF EPITAXIAL FERROELECTRIC FILMS

机译：内部应力对外延铁电薄膜相变特性和物理性能的影响

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摘要

Phase transformation characteristics and physical properties of thin films differ significantly from their bulk or single-crystal form due to the presence of internal stresses. In this paper, effect of internal stresses on the phase transformation characteristics and physical properties of epitaxial ferroelectric thin films are described via a thermodynamic approach. In particular, we analyze the change in the lattice parameter, the dielectric, tunability and pyroelectric properties of epitaxial BaTiO_3 and Ba_xSr_(1-x)TiO_3 films. It is shown that the misfit strain has pronounced effect on the absence of the structural aspects of the paraelectric-ferroelectric phase transformation and the degradation of properties in epitaxial films. On the other hand, theoretical analysis shows that enhanced properties may be achieved by adjusting the misfit strain in the vicinity of structural instability. The effect of film thickness variation and substrate selection, which are the common ways to adjust the misfit strain, are discussed.
机译：由于内部应力的存在，薄膜的相变特性和物理性质与它们的块状或单晶形式有很大不同。本文通过热力学方法描述了内应力对外延铁电薄膜相变特性和物理性能的影响。特别地，我们分析了外延BaTiO_3和Ba_xSr_（1-x）TiO_3薄膜的晶格参数，介电常数，可调谐性和热电性质的变化。结果表明，失配应变对缺少顺电-铁电相变的结构方面以及外延膜的性能下降具有显着影响。另一方面，理论分析表明，通过调节结构不稳定性附近的失配应变可以提高性能。讨论了膜厚变化和基板选择的影响，这是调整失配应变的常用方法。

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