金属氧化物缺陷结构与微观力学形变机制

金属氧化物缺陷结构与微观力学形变机制

李  雷^{1 #}，贾双凤^{1 #}，文广玉¹，赵培丽¹，管晓溪¹，胡帅帅¹，赵立功¹，郑　赫^{1, 2, 3 *}，王建波^1*

（1. 武汉大学物理科学与技术学院，电子显微镜中心，人工微结构教育部重点实验室和高等研究院，湖北武汉430072；2. 武汉大学苏州研究院，江苏苏州215123；3. 武汉大学深圳研究院，广东深圳518057）

摘　要　本文通过电子显微技术对金属氧化物的畴结构进行静态表征，并对其微观力学形变机理进行研究。（1）利用电子衍射和球差校正透射电子显微技术，对Mg-Al-O的畴结构以及原子尺度界面构型进行分析，实验结果表明阳离子空位的有序是形成MgAl_xO_y相的可能原因；（2）利用原位电子显微技术研究了量子限域尺度ZnO结构的稳定性及CuO纳米线的滞弹性，揭示了应力诱导的ZnO的可逆结构相变过程以及空位迁移诱导的CuO结构相变。论文结果有助于理解金属氧化物复杂缺陷结构与性能之间的关联。

关键词　金属氧化物；缺陷结构；原位透射电子显微学

中图分类号：TG115.21⁺5.3   

文献标识码：Adoi:10.3969/j.issn.1000-6281.2020.06.004

Defect structures and micro-mechanical deformation mechanisms of metal oxides

LI Lei^{1 #}，JIA Shuang-feng^{1 #}，WEN Guang-yu¹，ZHAO Pei-li¹，GUAN Xiao-xi¹，

HU Shuai-shuai¹，ZHAO Li-gong¹，ZHENG He^1，2，3∗，WANG Jian-bo^1∗

(1. School of Physics and Technology, Center for Electron Microscopy, MOE Key Laboratory of Artificial Micro- and Nano-structures, and Institute for Advanced Studies, Wuhan University, Wuhan Hubei 430072；2. Suzhou Institute of Wuhan University, Suzhou, Jiangsu 215123；3. Wuhan University Shenzhen Research Institute, Shenzhen, Guangdong 518057, China)

Abstract  In this paper, the domain structure of metal oxides was characterized by electron microscopy, and the micro mechanical deformation mechanism was studied. (1) The domain structure and atomic scale interface configuration of Mg-Al-O were analyzed by means of electron diffraction and spherical aberration correction transmission electron microscopy. The experimental results show that the order of cation vacancy is the possible reason for the formation of MgAlxOy phase; (2) the stability of quantum confinement scale ZnO structure and the anelasticity of CuO nanowires were studied by in-situ electron microscopy, which revealed the reversible phase transition of ZnO induced by stress and the phase transition of CuO induced by vacancy migration. The results facilitate the basic understanding of the relationship between complex defect structure and properties of metal oxides.

Keywords  metal oxide；defect structure；in-situtransmission electron microscopy

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