Al-O化合物中的有序超结构与取向畴

Al-O化合物中的有序超结构与取向畴

王正洲¹，文广玉¹，赵立功¹，赵培丽¹，蒋仁辉¹，庄园林¹，孟 琪¹，贾双凤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（AlO_x与AlO_y）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，AlO_x与AlO_y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。

关键词  尖晶石结构；γ-Al₂O₃；透射电子显微学；纳米管

中图分类号： TG115.21⁺5.3   

文献标识码： Adoi:10.3969/j.issn.1000-6281.2020.05.005

Ordered superstructures and orientation domains in Al-O oxides

WANG Zheng-zhou¹, WEN Guang-yu¹, ZHAO Li-gong¹, ZHAO Pei-li¹, JIANG Ren-hui¹, ZHUANG Yuan-lin¹, MENG Qi¹, 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  Al-O nanotubes were synthesized by chemical vapor deposition. Two alumina phases with monoclinic ordered superstructures in nanotubes and the 120° domains weresystematically 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 AlO_x and AlO_y phases will transform into γ-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.

Keywords　spinel structure; γ-Al₂O₃; transmission electron microscopy; nanotube

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