电子束辐照α-MoO_(3)原子尺度结构演变的原位表征  

Atomic-scale observation of the structure evolution ofα-MoO_(3)under electron beam irradiation

作　　者：王思铭 彭华雨 蒋仁辉 管晓溪 齐孟 马龙辉 贾双凤 郑赫 王建波 WANG Si-ming;PENG Hua-yu;JIANG Ren-hui;GUAN Xiao-xi;QI Meng;MA Long-hui;JIA Shuang-feng;Zheng-he;WANG Jian-bo(School of Physics and Technology,Center for Electron Microscopy,M0E Key Laboratory of Artificial Micro-and Nano-structures,and Institute for Advanced Studies,Wuhan University,Wuhan Hubei 430072;Suzhou Institute of Wuhan University,Suzhou Jiangsu 215123;Wuhan University Shenzhen Research Institute,Shenzhen Guangdong 518057,China)

机构地区：[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

出　　处：《电子显微学报》2021年第5期496-504,共9页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(Nos.52071237,12074290,51871169,51671148,11674251,51601132);中央高校基本科研业务费专项资金(No.2042019kf0190);江苏省自然科学基金资助项目(No.BK20191187);深圳市科创委基础研究面上项目(No.JCYJ20190808150407522);中国博士后科学基金资助项目(No.2019M652685)。

摘　　要：本文采用化学气相沉积法制备_(α)-MoO_(3)纳米带,利用原位透射电子显微技术表征了在[010]_(α)、[100]_(α)和[001]_(α)方向电子束辐照下_(α)-MoO_(3)纳米带的原子尺度结构演变。根据原位实验现象,本文提出了以氧空位和Mo原子迁移为核心的微观相变机制。本文发现三个方向会相变成由_(α)-MoO_(3)以及正交相S1和S2共同构成的中间相,并且沿[010]_(α)方向观察到_(α)-MoO_(3)经过中间相后最终相变成面心立方结构的MoO。本文加深了对_(α)-MoO_(3)结构还原相变的理解,为调控_(α)-MoO_(3)材料的结构和改善其性能提供了参考。In this paper,_(α)-MoO_(3) nanobelts were prepared by chemical vapor deposition method,and atomic-scale structure evolution of_(α)-MoO_(3) nanobelts was characterized by in-situ transmission electron microscopy under electron beam irradiation along[010]_(α),[100]_(α)and[001]_(α)directions.Based on in-situ experimental phenomena,this paper has proposed a microscopic phase transition mechanism with oxygen vacancies and Mo atom migration as the core.This paper found that the three directions will transform into the intermediate phase composed of_(α)-MoO_(3) and orthogonal phases S1 and S2,and the_(α)-MoO_(3) will eventually transform into a face-centered cubic structure of MoO after passing through the intermediate phase along the[010]_(α)direction.This article has deepened the understanding of the reduction phase transition of the_(α)-MoO_(3) structure,and provided a reference for controlling the structure of_(α)-MoO_(3) material and improving its performance.

关 键 词：三氧化钼(α-MoO_(3)) 电子束辐照 相变 透射电子显微学(TEM) 

分 类 号：TG146.4[一般工业技术—材料科学与工程] TG111.5[金属学及工艺—金属材料]