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首页> 外文期刊>Journal of Applied Physics >Microstructure of epitaxial Ba_(0.7)Sr_(0.3)TiO_3/SrRuO_3 bilayer films on SrTiO_3 substrates
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Microstructure of epitaxial Ba_(0.7)Sr_(0.3)TiO_3/SrRuO_3 bilayer films on SrTiO_3 substrates

机译：SrTiO_3衬底上外延Ba_（0.7）Sr_（0.3）TiO_3 / SrRuO_3双层薄膜的微观结构

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摘要

The thickness evolution of the microstructure of epitaxial Ba_(0.7)Sr_(0.3)TiO_3 thin films grown on SrRuO_3/SrTiO_3 was investigated by means of transmission electron microscopy. Within the Ba_(0.7)Sr_(0.3)TiO_3 layer, a layered structure (three sublayers) is distinguished as for the configuration of lattice strain and defects. The first sublayer extends for 3 nm from the lattice-coherent Ba_(0.7)Sr_(0.3)TiO_3/SrRuO_3 interface. The second 13-nm-thick sublayer forms a semicoherent interface with the first sublayer due to the creation of a misfit dislocation network. The third sublayer extends beyond the second sublayer exhibiting a structure characterized by compact columnar features. Planar defects are formed at the boundaries between such features. The formation of a layered structure within the Ba_(0.7)Sr_(0.3)TiO_3 films is discussed in the light of the growth modes of films on lattice-mismatched substrates.
机译：利用透射电子显微镜研究了生长在SrRuO_3 / SrTiO_3上的外延Ba_（0.7）Sr_（0.3）TiO_3薄膜的微观结构的厚度演化。在Ba_（0.7）Sr_（0.3）TiO_3层内，由于晶格应变和缺陷的构型而区分出层状结构（三个子层）。第一子层从晶格相干的Ba_（0.7）Sr_（0.3）TiO_3 / SrRuO_3界面延伸3 nm。由于形成失配位错网络，第二层13纳米厚的子层与第一层形成了半相干的界面。第三子层延伸超过第二子层，第二子层展现出以紧凑的柱状特征为特征的结构。在这些特征之间的边界处形成平面缺陷。根据晶格失配衬底上薄膜的生长模式，讨论了Ba_（0.7）Sr_（0.3）TiO_3薄膜内层状结构的形成。

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