globalchange  > 气候变化与战略
DOI: 10.1016/j.scib.2021.02.020
论文题名:
Direct observation of atomic-level fractal structure in a metallic glass membrane
作者: Jiang H.; Xu J.; Zhang Q.; Yu Q.; Shen L.; Liu M.; Sun Y.; Cao C.; Su D.; Bai H.; Meng S.; Sun B.; Gu L.; Wang W.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
语种: 英语
中文关键词: Atomic-resolution imaging ; Fractal packing ; Metallic glass ; Percolation theory
英文关键词: Amorphous alloys ; Atoms ; Fractal dimension ; Glass ; Glass transition ; Metals ; Solvents ; (metallic) glass ; Atomic levels ; Atomic-resolution imaging ; Direct observations ; Fractal packing ; Fractal structures ; Glass membranes ; Grand Challenge ; Metallics ; Percolation theory ; Metallic glass
英文摘要: Determination and conceptualization of atomic structures of metallic glasses or amorphous alloys remain a grand challenge. Structural models proposed for bulk metallic glasses are still controversial owing to experimental difficulties in directly imaging the atom positions in three-dimensional structures. With the advanced atomic-resolution imaging, here we directly observed the atomic arrangements in atomically thin metallic glassy membranes obtained by vapor deposition. The atomic packing in the amorphous membrane is shown to have a fractal characteristic, with the fractal dimension depending on the atomic density. Locally, 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 with 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. © 2021 Science China Press
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170290
Appears in Collections:气候变化与战略

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作者单位: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China; Songshan Lake Materials Laboratory, Dongguan, 523808, China; Department of Materials Science & Engineering, Center of Electron Microscopy and State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou, 310027, China; Qian Xuesen Laboratory of Space Technology, Beijing, 100094, China; Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, United States; School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China

Recommended Citation:
Jiang H.,Xu J.,Zhang Q.,et al. Direct observation of atomic-level fractal structure in a metallic glass membrane[J]. Science Bulletin,2021-01-01
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