铁电性
凝聚态物理
材料科学
外延
电介质
压电
极化(电化学)
现象学模型
薄膜
热力学势
光电子学
物理
图层(电子)
纳米技术
热力学
复合材料
化学
物理化学
作者
V. G. Koukhar,N. A. Pertsev,Rainer Waser
出处
期刊:Physical review
日期:2001-11-08
卷期号:64 (21)
被引量:230
标识
DOI:10.1103/physrevb.64.214103
摘要
A Landau-Ginsburg-Devonshire-type nonlinear phenomenological theory is presented, which enables the thermodynamic description of dense laminar polydomain states in epitaxial ferroelectric thin films. The theory explicitly takes into account the mechanical substrate effect on the polarizations and lattice strains in dissimilar elastic domains (twins). Numerical calculations are performed for PbTiO3 and BaTiO3 films grown on (001)-oriented cubic substrates. The "misfit strain-temperature" phase diagrams are developed for these films, showing stability ranges of various possible polydomain and single-domain states. Three types of polarization instabilities are revealed for polydomain epitaxial ferroelectric films, which may lead to the formation of new polydomain states forbidden in bulk crystals. The total dielectric and piezoelectric small-signal responses of polydomain films are calculated, resulting from both the volume and domain-wall contributions. For BaTiO3 films, strong dielectric anomalies are predicted at room temperature near special values of the misfit strain.
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