α-Fe2O3的原子尺度界面结构与演变

α-Fe₂O₃的原子尺度界面结构与演变

马龙辉，孟  爽，蒋仁辉，陈国旭佳，孟  琪，李  雷，赵培丽，张  莹，王思铭，贾双凤，郑  赫^*，王建波^*

（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  本文通过化学气相沉积法制备出α-Fe₂O₃纳米线，并利用透射电子显微术进行研究。发现，α-Fe₂O₃纳米线具有双晶结构，双晶界面呈“L”型，由界面Ⅰ、Ⅱ、Ⅲ组成，其中界面Ⅰ和界面Ⅱ分别由特定的晶面周期性交替排列，呈锯齿状；而界面Ⅲ则由多个晶面无序地排列构成，呈弯曲状。同时，电子能量损失谱表明无序的界面Ⅲ处存在Fe空位。进一步研究发现，在电子束辐照下单晶α-Fe₂O₃会还原成Fe₃O₄，且存在两种特定的取向关系，分别为：（1），；（2），。本文的工作有助于理解α-Fe₂O₃纳米材料的复杂结构。

关键词  α-Fe₂O₃；双晶；界面；电子束辐照；透射电子显微学

中图分类号：O611.4；TG14；TG115.21⁺5.3  

文献标识码：A doi:10.3969/j.issn.1000-6281.2021.05.007

The atomic-scale interface structure and evolution of α-Fe₂O₃

MA Long-hui¹, MENG Shuang¹, JIANG Ren-hui¹, CHEN Guo-xu-jia¹, ZHANG Ying¹, MENG Qi¹, Li Lei¹, ZHAO Pei-li¹, WANG Si-ming¹, JIA Shuang-feng¹, 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  Single-crystalline and bicrystalline α-Fe₂O₃ nanowires were successfully synthesized by chemical vapor deposition, and characterized by transmission electron microscopy. The nanowire bicrystal interface is found to be "L" shape consisting of three interfaces: Ⅰ, Ⅱ, and Ⅲ. Interface Ⅰ and Ⅱ are periodically arranged and alternately with specific crystal planes in a zigzag shape, respectively. Interface Ⅲ is curved and composed of multiple crystal planes arranged disorderly. Meanwhile, the electron energy loss spectrum indicates that Fe vacancies exist at the disordered interface III. Detailed investigation revealsthat single-crystalline α-Fe₂O₃ could be reduced to Fe₃O₄ under electron beam irradiation with two different orientation relationships:(1) , ; (2) , . Our work helps to understand the complex structure of α-Fe₂O₃ nanomaterials.

Keywords  α-Fe₂O_3;bicrystal;interface;electron beam irradiation;transmission electron microscopy

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