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相关概念视频

X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

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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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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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通过电子衍射对纳米材料进行定量三维局部顺序分析.

Ella Mara Schmidt1,2,3, Paul Benjamin Klar4,5, Yaşar Krysiak5,6

  • 1Faculty of Geosciences and MAPEX Center for Materials and Processes, University of Bremen, Bremen, Germany. ella.schmidt@uni-bremen.de.

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概括

了解材料中的混乱是发现新属性的关键. 这项研究使用电子衍射和3D-ΔPDF分析量化了局部原子排序,验证了用伊特里亚稳定的方法.

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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.
  • 凝聚物质物理学 凝聚物质物理学

背景情况:

  • 在材料设计中,结构与属性关系是基本的.
  • 无序材料提供了在有序对应物中找不到的独特特性.
  • 量化地方排序原则对于理解混乱与财产关系至关重要.

研究的目的:

  • 开发和验证一种用于量化材料局部秩序的方法.
  • 将三维电子衍射与三维差异对分布函数 (3D-ΔPDF) 分析相结合.
  • 为了证明这种综合方法对分析无序材料的可靠性.

主要方法:

  • 利用三维电子衍射来测量微米以下晶体上的单晶衍射.
  • 应用了三维差异对分布函数 (3D-ΔPDF) 分析来探测局部秩序.
  • 将电子衍射的3D-ΔPDF结果与中子和X射线实验的结果进行比较.

主要成果:

  • 成功地将3D-ΔPDF分析应用于电子衍射数据.
  • 证明了联合电子衍射和3D-ΔPDF方法的可靠性.
  • 验证了使用 yttria稳定 (Zr0.82Y0.18O1.91) 作为模型系统的方法.

结论:

  • 3D电子衍射和3D-ΔPDF分析的结合提供了一种可靠的方法来量化材料中的局部秩序.
  • 这种方法克服了使用分散分散分析分析粉样所面临的挑战.
  • 这些发现为理解和设计具有量身定制性质的无序材料开辟了新的途径.