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原子尺度体积和粒度边界扩散,由现场STEM阐明
Peter Schweizer1, Amit Sharma2, Laszlo Pethö2
1Swiss Federal Laboratories for Materials Science and Engineering (Empa), Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, 3602, Thun, Switzerland. peter.ps.schweizer@outlook.com.
Nature communications
|November 22, 2023
概括
科学家们观察到单个原子在原子尺度上的金属矩阵中扩散. 这项研究证实了随机步行过程,并量化了扩散动力学,提高了对体积扩散机制的理解.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 物理化学 物理化学
背景情况:
- 在材料科学中,扩散对于合成,加工和应用至关重要.
- 关于热刺激体积扩散的原子尺度观测存在基本的知识差距.
- 随着缺陷扩散的机制和动力学,如谷物边界,需要进一步阐明.
研究的目的:
- 在原子尺度上的金属矩阵中研究原子的体积扩散过程.
- 提供热刺激扩散的直接,原子级观测.
- 要区分体积扩散和沿缺陷扩散.
主要方法:
- 使用现场高分辨率扫描传输电子显微镜 (HR-STEM).
- 在高温下观察了单个原子在晶格中的随机运动.
- 通过直接的原子跟踪量化扩散动力学.
主要成果:
- 直接观察并证实单个原子的随机步行过程.
- 在原子尺度上量化体积扩散的动力学.
- 成功地区分了晶格内部的扩散 (体积扩散) 和沿缺陷的扩散.
结论:
- 巩固和完善了对体积扩散的基本机制的理解.
- 提供了前所未有的原子规模的洞察力,了解晶体固体中的扩散.
- 证明了HR-STEM在实时原子扩散研究方面的能力.
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