more>>在线期刊
more>>新闻发布
more>>相关下载
友情连接

应力作用下单晶钛酸钡亚微米柱相、畴演变的原位电子显微镜研究

任义丰，庞振涛，王志超，周雪松，许 航，毛亚川，陈 茂，邓 昱*
  • 摘要
  • 参考文献
  • 相关文章

2025年 第44卷 第2期: 1000-6281（2025）02-153-07     下载地址：

应力作用下单晶钛酸钡亚微米柱相、畴演变的原位电子显微镜研究

任义丰，庞振涛，王志超，周雪松，许 航，毛亚川，陈 茂，邓 昱*

(1. 南京大学物理学院，江苏 南京 210023; 2. 南京大学现代工程与应用科学学院, 江苏 南京 210093; 3. 南京大学固体微结构物理国家重点实验室，江苏 南京 210093)

摘 要 在应力场作用下，铁电材料中铁电/铁弹性畴的演化是一个重要而复杂的过程，这一过程涉及到跨尺度层次结构的相互作用。为了解关键的局部微观结构演变，本文利用原位透射电镜（TEM）直接观察了应力诱导钛酸钡（BaTiO3）亚微米柱的层次结构演变。结果表明，相、畴演化对加载方式（加载/卸载速率、应力维持时间和应力大小）较为敏感。在室温下，通过慢循环压缩（加载高达0.5GPa，应变速率为10-4/s，循环100次）可以引入由四方相到四方-正交相边界的应变驱动相变。基于此，本文提出了一种机械方法，在BaTiO3中获得稳定良好的高密度多畴多相共存结构，具有潜在的应用前景。

关键词 钛酸钡铁电材料；相畴结构；应力场；原位电子显微学

中图分类号：TB383；TG115. 5；TG115.21+5.3；O76 文献标识码：A A Doi:10.3969/j.issn.1000-6281.2025.02.002

 

In-situ electron microscopy studies on phase and domain evolution of BaTiO3 sub-micrometer pillar under stress

REN Yifeng, PANG Zhentao, WANG Zhichao, ZHOU Xuesong, XU Hang, MAO Yachuan, CHEN Mao, DENG Yu*

(1. School of Physics, Nanjing University, Nanjing Jiangsu 210093；2. Department of Materials Science and Engineering, College of Engineering and Applied Sciences, Nanjing University, Nanjing Jiangsu 210023；3. Solid State Microstructure National Key Lab and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing Jiangsu 210093)

Abstract The evolution of ferroelectric/ferroelastic domains in ferroelectric materials under stress is a significant and complex process. This process involves the interaction of hierarchical domain structures across multiple scales. In this study, we employed in-situ transmission electron microscopy (TEM) to directly observe the stress-induced hierarchical domain evolution in BaTiO3 sub-micrometer pillars. The results indicate that domain evolution is sensitive to loading conditions, including loading/unloading speed, stress maintenance duration, and stress amplitude. We observed a strain-driven phase transition from the tetragonal phase to the tetragonal-orthorhombic phase boundary, which can be induced by slow cycling compressions (up to 0.5 GPa, strain rate of 10−4/s, 100 cycles) at room temperature. Based on these findings, we developed a mechanical method to achieve well-stabilized, high-density, multiple-phase-coexisting structures in BaTiO3 for potential applications.

Keywords BaTiO3 ferroelectric material; phase and domain structures; stress field; in-situ transmission electron microscope