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相关概念视频

X-ray Crystallography02:18

X-ray Crystallography

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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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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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通过扫描绘制纳米晶体定向的映射,用于多峰布拉格连贯衍射成像的Laue衍射显微镜.

Yueheng Zhang1, J Nicholas Porter2, Matthew J Wilkin1

  • 1Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.

Journal of synchrotron radiation
|May 31, 2023
PubMed
概括

一种新方法简化了从多个纳米晶峰收集布拉格连贯衍射成像 (BCDI) 数据的收集. 这种技术使得纳米晶体的精确定位和映射,即使在复杂的,异质的样本.

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在 BCDI 找 BCDI布拉格衍射法是什么?劳埃的衍射是没有的.同步机同步机同步机同步机

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科学领域:

  • 材料科学 材料科学 材料科学
  • 晶体学 晶体学是指结晶学.
  • 纳米技术 纳米技术

背景情况:

  • 布拉格连贯衍射成像 (BCDI) 对于分析亚微米样本至关重要.
  • 从多个纳米晶体收集多峰BCDI数据是复杂的.
  • 不同质的样本和多个粒度构成重大挑战.

研究的目的:

  • 开发一种工作流程,用于在不同基板上定位和映射纳米晶体.
  • 为了简化从多个布拉格山峰收集BCDI数据.
  • 为了实现孤立和密集分布的纳米晶体的3D成像.

主要方法:

  • 在先进光子源 (APS) 34-ID-C光线线上调用移动单色仪.
  • 使用扫描Laue衍射显微镜进行纳米晶体定向和映射.
  • 使用代阶段检索算法来构建体积应变张量器.
  • 通过电子反散衍射 (EBSD) 测量验证结果.

主要成果:

  • 建立了一个简化的工作流程来收集多峰BCDI数据.
  • 该方法准确地定位和映射不同基板材料上的纳米晶体.
  • 来自Laue衍射显微镜的实验纹理图与EBSD数据相对应得很好.
  • 对于分离的纳米晶体和密集的纳米晶体,都实现了可靠的索引.

结论:

  • 开发的工作流大大简化了BCDI对纳米晶体的数据收集.
  • 扫描Laue衍射显微镜提供了强大的纳米晶体定向和映射.
  • 这种技术为具有挑战性的纳米晶体系统的3D成像提供了强大的工具.