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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 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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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
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The de Broglie Wavelength02:32

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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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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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在fcc电子衍射模式中的扩散强度的起源

Francisco Gil Coury1, Cody Miller2, Robert Field3

  • 1Materials Engineering Department (DEMa), Universidade Federal de São Carlos, São Carlos, Brazil. fgcoury@ufscar.br.

Nature
|October 25, 2023
PubMed
概括

面中心立方体 (fcc) 材料的电子衍射模式中的扩散强度通常是由更高阶的Laue区域反射引起的,而不是复杂的缺陷. 这一发现简化了对各种fcc合金的电子衍射数据的解释.

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科学领域:

  • 材料科学
  • 晶体学
  • 电子显微镜

背景情况:

  • 对多元元素合金来说,解释电子衍射模式中的扩散强度是复杂的.
  • 以前,面中心立方合金 (fcc) 的扩散强度归因于短距离顺序,中距离顺序或各种平面缺陷.
  • 这些解释在准确地描述物质结构方面带来了挑战.

研究的目的:

  • 为了证明fcc材料的电子衍射模式中的许多观察到的扩散强度来自更高阶的Laue区域 (HOLZ) 反射.
  • 为导致散射强度的HOLZ反射提供理论解释和实验验证.
  • 为区分HOLZ反射和缺陷引起的强度提供一个框架.

主要方法:

  • 分析各种fcc材料的电子衍射模式,包括CdTe,纯Ni和纯Al.
  • 应用电子衍射理论来建模和解释观察到的扩散强度.
  • 计算的HOLZ反射强度与实验数据的比较.

主要成果:

  • 分散强度,特别是{422}和{311}在选定的区域衍射模式中的反射,被确定为HOLZ反射.
  • 在一系列fcc材料中,在不同区域轴上观察到类似的HOLZ反射特征.
  • 计算的HOLZ强度与观察到的强度非常相匹配,证实了它们在fcc材料中的普遍性.

结论:

  • 高级劳埃带反射是fcc材料电子衍射模式中分散强度的常见来源.
  • 这种理解简化了复杂的衍射数据的解释,减少了对短距离或中距离顺序的错误归因.
  • 这项研究为电子衍射分析中精确识别和定位扩散强度提供了强大的框架.