基于球差校正扫描透射电镜的快离子导体β-Ag2S中Ag占位表征  

Characterization of Ag site occupation in fast ionic conductor β-Ag2S by spherical-aberration-corrected scanning transmission electron microscopy

作　　者：刘军[1] 陈陆[1] 王勇[1] 张泽[1] LIU Jun;CHEN Lu;WANG Yong;ZHANG Ze(Center of Electron Microscopy and State Key Laboratory of Silicon Materials,School of Materials Science and Engineering,Zhejiang University,Hangzhou Zhejiang 310027,China)

机构地区：[1]浙江大学电子显微镜中心材料科学与工程学院硅材料国家重点实验室

出　　处：《电子显微学报》2019年第3期209-214,共6页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(Nos.51390474,11327901)

摘　　要：目前学界对β-Ag2S快离子导体中Ag原子占位仍未认识清楚,而这一问题对理解β-Ag2S的导电机理等特性具有重要意义。本文首次报道了基于球差校正扫描透射电镜(STEM)的β-Ag2S快离子导体中Ag原子占位表征。沿[100]β、[110]β、[210]β和[111]β方向的原子级分辨率高角环形暗场(HAADF)像与QSTEM软件高分辨模拟图像对比结果表明Ag原子在6(b)、12(d)和24(h)三类间隙均有分布。原位加热实验结果表明,当温度上升到300℃时Ag原子占位并未发生明显变化。本文为理解β-Ag2S的结构提供了直接的重要信息。The site occupation of Ag atom in β-Ag2S, which is of great importance for understanding the electrical conduction mechanism and other characteristics of β-Ag2S, has still not been fully solved. In this paper, the site occupation of Ag atom in β-Ag2S was characterized for the first time using spherical aberration( C s )-corrected STEM. The atomic-resolution high-angle annular dark field(HAADF)images along [100]β,[1 10]β,[210]β and [111 ]β zone axes and the simulated HAADF images indicate that Ag atoms occupied 6( b ), 12( d ) and 24( h ) interstices of S framework. In situ heating experiment results show that the site occupation of Ag atoms kept unchanged even when heated to 300 ℃. This work provides new critical information for thoroughly understanding the structure β-Ag2S.

关 键 词：β-Ag2S 球差校正 STEM 原子占位 

分 类 号：O766.1[理学—晶体学] TG115.215.3[金属学及工艺—物理冶金]