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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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The de Broglie Wavelength02:32

The de Broglie Wavelength

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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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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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
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相关实验视频

Updated: Sep 17, 2025

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

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使用电子衍射揭示障碍参数和变形电子密度.

Weixiao Lin1,2, Zefan Xue1,2, Wenjun Cui1,2

  • 1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, China.

Nature communications
|July 1, 2025
PubMed
概括
此摘要是机器生成的。

定量收束电子衍射 (QCBED) 现在准确地测量了材料中的混乱. 这种电子密度方法揭示了化学扰乱增加了晶格振动,但对电子密度分布的影响很小.

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Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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科学领域:

  • 材料科学 材料科学 材料科学
  • 固态物理 固态物理
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 当地的原子尺度障碍通过改变电子密度,显著影响材料特性.
  • 对电子密度的实验性确定对于理解这些疾病至关重要.
  • 定量收束电子衍射 (QCBED) 已为有序晶体确立,但其在无序系统中的应用是不确定的.

研究的目的:

  • 调查QCBED的适用性,以量化化学无序材料中的局部乱参数.
  • 为了同时确定化学乱,变形电子密度 (ΔρEXP) 和德拜-沃勒因子 (DWF).
  • 验证QCBED作为一种强大的方法来表征无序系统.

主要方法:

  • 采用了多束区域外轴CBED技术.
  • 在布洛赫波形式主义中使用了连贯的潜在近似.
  • 密度函数理论 (DFT) 的计算在具有随机原子分布的超级细胞上进行.

主要成果:

  • QCBED成功确定了化学乱参数,ΔρEXP和DWF在有序L10FePd和无序γ相FePd中.
  • 发现化学干扰显著增加了DWFs.
  • 化学干扰对ΔρEXP的影响可以忽略不计.

结论:

  • QCBED被验证为一种可靠的方法,用于量化化学失序系统中的局部失序.
  • 这种技术弥合了对无序材料的表征的关键差距.
  • 这些发现提供了关于化学乱和晶格动态之间的关系的见解.