无序超结构Na5W14O44的制备与原子尺度表征

无序超结构Na₅W₁₄O₄₄的制备与原子尺度表征

蒋仁辉，李  佩，林泽圣，李  雷，赵培丽，孟威威，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    本文采用热氧化法制备了单晶（800 ℃）和具有无序超结构（600 ℃）的Na₅W₁₄O₄₄纳米片，利用扫描透射电子显微技术在原子尺度解析了无序超结构样品中单胞厚度的层状旋转畴结构。旋转畴的旋转角为120°和180°，不同厚度的旋转畴无序地拼接在一起构成无序超结构Na₅W₁₄O₄₄。根据群论的知识，从理论上解释了旋转畴结构形成的原因，结合实验确定了120°旋转的2种取向关系。本文加深了对复杂畴结构Na₅W₁₄O₄₄生长机理的理解，为调控层状结构的钠钨青铜材料的结构和性能提供了重要参考。

关键词    Na₅W₁₄O₄₄；旋转畴；超结构；群论；透射电子显微学（TEM）

中图分类号: TG115. 21⁺ 5. 3; O766⁺. 1; O753⁺. 1; O722⁺. 4; O761; O763; O781  

文献标识码: A   doi:10.3969/j.issn.1000-6281.2022.04.008

The preparation and atomic-scale characterization of disordered superstructure Na₅W₁₄O₄₄

JIANG Ren-hui¹，LI Pei¹，LIN Ze-sheng¹，LI Lei¹，ZHAO Pei-li¹，MENG Wei-wei¹，

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    In this paper, Na₅W₁₄O₄₄ nanosheets with single-crystal (800 ℃) and disordered superstructure (600 ℃) were prepared by thermal oxidation method, and the single-cell thicknesses of the lamellar rotational domains in the samples were investigated at the atomic scale using transmission electron microscopy. The rotational angles of the lamellar rotational domains were mainly 120° and 180°, and the disordered superstructure of Na₅W₁₄O₄₄ was formed by combining domains of different thicknesses in a disordered manner.Two orientation relations for 120° rotation were determined in combination with experiments.This paper has provided a deeper understanding of the growth mechanism of the Na₅W₁₄O₄₄ with complicated domain structure, which is a significant reference for the regulation of the structure and properties in sodium tungsten bronze materials with lamellar structure.

keywords    Na₅W₁₄O₄₄; rotational domains；super structure；group theory；transmission electron microscopy (TEM)

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