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相关概念视频

X-ray Crystallography02:18

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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在复杂的FCC合金中通过4D-STEM空间波动和相关性分析区分电子扩散

Po-Cheng Kung1, Rui Feng2, Peter Liaw3

  • 1Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304W. Green Street, Urbana 61801, IL, USA.

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|September 6, 2025
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概括

这项研究引入了一种新的方法,即FluCor分析,用于解释复杂合金中的扩散散. 它将化学短距离订制 (CSRO) 信号与其他来源区分开来,澄清了先进材料中的散射起源.

关键词:
4D-STEM的使用化学短程订购分散散射中等透合金

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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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科学领域:

  • 材料科学
  • 凝聚物质物理学
  • 晶体学

背景情况:

  • 复杂的面中心立方 (FCC) 合金经常表现出化学短程排序 (CSRO).
  • 由于缺陷和热扩散,解释这些合金中的扩散具有挑战性.
  • 区分CSRO信号与其他散射现象仍然是一个重要的辩论.

研究的目的:

  • 开发和展示一种用于分析局部扩散的新方法.
  • 在复杂合金中区分各种分散散射源.
  • 解决射信号的模两可,特别是在1/3{422}和1/2{311}位置.

主要方法:

  • 局部扩散的空间波动和相关性 (FluCor) 分析.
  • 四维扫描传输电子显微镜 (4D-STEM) 用于数据采集.
  • 适用于 (CrCoNi) 93Al4Ti2Nb 中等合金 (MEA).

主要成果:

  • 在研究的MEA中,FluCor分析成功地区分了扩散散源.
  • 在1/3{422}和1/2{311}位置发现了两个重叠的扩散信号.
  • 这些信号归因于非CSRO来源:纳米级平面缺陷和热扩散.

结论:

  • FluCor分析方法有效地解决了复杂的分散模式.
  • 该研究澄清了FCC合金中的特定散射信号的来源,将其归因于缺陷和热效应,而不是CSRO.
  • FluCor方法广泛适用于各种无序晶体,为材料微观结构和CSRO行为提供了洞察力.