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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Microstructural and electrical properties of BaTiO3 epitaxial films on SrTiO3 substructures with a LaNiO3 conductive layer as a template
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Microstructural and electrical properties of BaTiO3 epitaxial films on SrTiO3 substructures with a LaNiO3 conductive layer as a template

机译：以LaNiO3导电层为模板的SrTiO3亚结构上BaTiO3外延膜的微结构和电学性能

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摘要

BaTiO3 (BTO) films have been epitaxially grown on SrTiO3(001) and SrTiO3( 111) substrates with a LaNiO3 conductive layer as a template using pulsed laser deposition. X-ray diffraction theta-2 theta and psi scanning reveal that the epitaxial relationship for these samples fabricated at 600 degrees C and 700 degrees C are BTO[001]//LNO[001]//STO[001] and BTO[111]//LNO[111]//STO[111], respectively. Ex situ reflective high energy electron diffraction patterns also clearly confirm this epitaxial relationship. The epitaxial growth can be more easily realized on LNO-inserted STO(001) substrates at a relatively wide range of temperatures. From C-V measurements, the dielectric constant of the epitaxial (001) BTO film is determined as 159.5, which is larger than the value 89.6 of (111) BTO film. The remanent polarization (2P(r)) of the epitaxial BTO(001) thin film on the LNO-coated (001) STO substrate is 39.8 mu C cm(-2), which is much larger than that of the BTO(111) film on the LNO-coated STO(111) substrate. The result is also consistent with the direct observation made by piezoresponse force microscopy investigation. Thus, with the epitaxial LNO electrode template layers, the epitaxial BaTiO3(001) ferroelectric films exhibit high-quality structure and good electrical properties.
机译：BaTiO3（BTO）膜已使用脉冲激光沉积在LaNiO3导电层作为模板的SrTiO3（001）和SrTiO3（111）衬底上外延生长。 X射线衍射theta-2 theta和psi扫描显示，在600摄氏度和700摄氏度下制造的这些样品的外延关系分别为BTO [001] // LNO [001] // STO [001]和BTO [111] // LNO [111] // STO [111]。异位反射高能电子衍射图谱也清楚地证实了这种外延关系。在相对较宽的温度范围内，可以在插入LNO的STO（001）基板上更轻松地实现外延生长。根据C-V测量，外延（001）BTO​​膜的介电常数确定为159.5，该值大于（111）BTO​​膜的值89.6。 LNO涂层（001）STO衬底上的外延BTO（001）薄膜的剩余极化（2P（r））为39.8μC cm（-2），比BTO（111）的大得多。 LNO涂层的STO（111）基板上的薄膜。该结果也与压电响应力显微镜研究的直接观察结果一致。因此，利用外延LNO电极模板层，外延BaTiO 3（001）铁电体膜表现出高质量的结构和良好的电性能。

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