BaTiO3 陶瓷挠电响应的晶粒尺寸效应

IF 2.7 3区 物理与天体物理 Q2 PHYSICS, APPLIED
Xu Yang, Baoju Xia, Xiongxin Guo, Yagang Qi, Zhen Wang, Zhenxiao Fu, Yu Chen, Ruzhong Zuo, Baojin Chu
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引用次数: 0

摘要

尺寸效应是铁电材料中的一个基本现象,人们已经观察到 BaTiO3(BTO)陶瓷的介电和压电特性与晶粒尺寸有关。然而,迄今为止,还没有关于挠电响应与晶粒尺寸相关性的报道。在这项研究中,我们采用两步烧结法制备了晶粒大小为 0.59 至 8.90 μm 的 BTO 陶瓷。我们发现,随着晶粒尺寸的增大,BTO 陶瓷的挠电系数从小于 20 μC/m (晶粒尺寸为 0.59-0.69 μm)增加到大于 300 μC/m(晶粒尺寸为 8.90 μm),但挠电响应的晶粒尺寸依赖性与介电和压电特性的晶粒尺寸依赖性不同。压电响应力显微镜的观察结果表明,BTO 陶瓷的表面区域是自发极化的。通过掠入射 X 射线衍射测量到了强烈的不均匀应变,由此产生的挠电效应足以使表面区域极化。挠电数据的拟合结果表明,极化表面层机制可以很好地解释挠电响应的晶粒尺寸效应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Grain size effect of the flexoelectric response in BaTiO3 ceramics
Size effect is a fundamental phenomenon in ferroelectric materials and grain size dependence of the dielectric and piezoelectric properties of BaTiO3 (BTO) ceramics has been observed. However, the dependence of flexoelectric response on grain size has not been reported, thus far. In this work, BTO ceramics with grain sizes ranging from 0.59 to 8.90 μm were prepared by a two-step sintering method. We found that with increasing grain size, the flexoelectric coefficient of BTO ceramics increases from less than 20 μC/m (grain size 0.59–0.69 μm) to more than 300 μC/m (grain size 8.90 μm), but the grain size dependence of the flexoelectric response is different from that of the dielectric and piezoelectric properties. Observation by piezoresponse force microscopy reveals that the surface regions of BTO ceramics are spontaneously polarized. Strong inhomogeneous strain is measured by grazing incidence x-ray diffraction and the resultant flexoelectric effect is enough to polarize the surface regions. Fitting of the flexoelectric data indicates that the grain size effect of the flexoelectric response can be well explained by the polarized surface layer mechanism.
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来源期刊
Journal of Applied Physics
Journal of Applied Physics 物理-物理:应用
CiteScore
5.40
自引率
9.40%
发文量
1534
审稿时长
2.3 months
期刊介绍: The Journal of Applied Physics (JAP) is an influential international journal publishing significant new experimental and theoretical results of applied physics research. Topics covered in JAP are diverse and reflect the most current applied physics research, including: Dielectrics, ferroelectrics, and multiferroics- Electrical discharges, plasmas, and plasma-surface interactions- Emerging, interdisciplinary, and other fields of applied physics- Magnetism, spintronics, and superconductivity- Organic-Inorganic systems, including organic electronics- Photonics, plasmonics, photovoltaics, lasers, optical materials, and phenomena- Physics of devices and sensors- Physics of materials, including electrical, thermal, mechanical and other properties- Physics of matter under extreme conditions- Physics of nanoscale and low-dimensional systems, including atomic and quantum phenomena- Physics of semiconductors- Soft matter, fluids, and biophysics- Thin films, interfaces, and surfaces
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