材料科学
位错
极化(电化学)
透射电子显微镜
制作
凝聚态物理
晶体学点群
结晶学
纳米技术
物理
晶体结构
复合材料
化学
物理化学
病理
医学
替代医学
作者
Peng Gao,Shu Yang,Ryo Ishikawa,Ning Li,Bin Feng,Akihito Kumamoto,Naoya Shibata,Pu Yu,Yuichi Ikuhara
标识
DOI:10.1103/physrevlett.120.267601
摘要
Owing to the broken translational symmetry at dislocations, a strain gradient naturally exists around the dislocation cores and can significantly influence the electrical and mechanical properties. We use aberration corrected scanning transmission electron microscopy to directly measure the flexoelectric polarization (∼28 μC cm^{-2}) at dislocation cores in SrTiO_{3}. The polarization charges can interact with the nonstoichiometric dislocation cores and thus impact the electrical activities. Our findings can help us to understand the properties of dislocations in perovskite, providing new insights into the design of new devices via defect engineering such as bicrystal fabrication and thin film growth.
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