Direct observation of atomic-level fractal structure in a metallic glass membrane

作     者：Hongyu Jiang Jiyu Xu Qinghua Zhang Qian Yu Laiquan Shen Ming Liu Yitao Sun Chengrong Cao Dong Su Haiyang Bai Sheng Meng Baoan Sun Lin Gu Weihua Wang 姜红玉;徐纪玉;张庆华;余倩;沈来权;刘明;孙奕韬;曹乘榕;苏东;白海洋;孟胜;孙保安;谷林;汪卫华

作者机构：Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan Lake Materials LaboratoryDongguan 523808China Department of Materials Science&EngineeringCenter of Electron Microscopy and State Key Laboratory of Silicon MaterialsZhejiang UniversityHangzhou 310027China Qian Xuesen Laboratory of Space TechnologyBeijing 100094China Department of Materials Science and EngineeringUniversity of Wisconsin-MadisonMadisonWisconsin 53706USA School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Science Bulletin》 (科学通报（英文版）)

年 卷 期：2021年第66卷第13期

页      面：1312-1318,M0004页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：This work was supported by the National Natural Science Foundation of China(51672307,51801230,51822107,and 51671121) the National Key Research and Development Program of China(2018YFA0703603) the National Natural Science Foundation of Guangdong Province(2019B030302010) the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB30000000) Beijing Natural Science Foundation(Z190010) 

主　　题：Metallic glass Atomic-resolution imaging Fractal packing Percolation theory 

摘      要：Determination and conceptualization of atomic structures of metallic glasses or amorphous alloys remain a grand *** models proposed for bulk metallic glasses are still controversial owing to experimental difficulties in directly imaging the atom positions in three-dimensional *** the advanced atomic-resolution imaging,here we directly observed the atomic arrangements in atomically thin metallic glassy membranes obtained by vapor *** atomic packing in the amorphous membrane is shown to have a fractal characteristic,with the fractal dimension depending on the atomic ***,the atomic configuration for the metallic glass membrane is composed of many types of polygons with the bonding angles concentrated on 45°-55°.The fractal atomic structure is consistent with the analysis by the percolation theory,and may account for the enhanced relaxation dynamics and the easiness of glass transition as reported for the thin metallic glassy films or glassy surface.