Al-O化合物中的有序超结构与取向畴  

Ordered superstructures and orientation domains in Al-O oxides

作　　者：王正洲 文广玉 赵立功 赵培丽 蒋仁辉 庄园林 孟琪 贾双凤 郑赫 王建波 WANG Zheng-zhou;WEN Guang-yu;ZHAO Li-gong;ZHAO Pei-li;JIANG Ren-hui;ZHUANG Yuan-lin;MENG Qi;JIA Shuang-feng;ZHENG He;WANG Jian-bo(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;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》2020年第5期487-497,共11页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(Nos.51871169,51671148,11674251,51501132,51601132);中央高校基本科研业务费专项资金资助项目(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资助(No.JCYJ20190808150407522);中国博士后科学基金资助项目(No.2019M652685).

摘　　要：本文通过化学气相沉积法制备出Al-O纳米管,利用透射电子显微技术对两种单斜有序超结构相(AlOx与AlOy)及其取向畴进行了系统表征,分析表明铝离子空位的有序分布是导致超结构形成的主要原因,进一步探讨了超结构相与尖晶石γ-Al2O3相的结构关联。在电子束辐照下,AlOx与AlOy逐渐相变为γ-Al2O3,对应阳离子空位分布从有序到无序的转变。最后,基于纳米材料的气-液-固(V-L-S)生长机制和柯肯达尔效应,对纳米管的生长机理进行分析。实验结果有助于理解Al-O纳米材料复杂结构及其关联。Al-O nanotubes were synthesized by chemical vapor deposition.Two alumina phases with monoclinic ordered superstructures in nanotubes and the 120°domains were systematically characterized by transmission electron microscopy.The superstructures may be caused by the disordered-ordered transition of cation vacancy.Besides,the ordered superstructures will gradually disappear during the irradiation of electron beam.The monoclinic AlOx and AlOy phases will transform intoγ-Al2O3 phase after the irradiation.Finally,the growth mechanisms of nanotube were explained based on the Kirkendall effect.The experimental results shed light on the structural characteristics of the Al-O nanomaterials,which is crucial for the rational design regarding the potential applications.

关 键 词：尖晶石结构 Γ-AL2O3 透射电子显微学 纳米管 

分 类 号：O76[理学—晶体学] O792