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相关概念视频

Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
X-ray Crystallography02:18

X-ray Crystallography

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...
X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

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 crystal...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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相关实验视频

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Experimental Strategies to Bridge Large Tissue Gaps in the Injured Spinal Cord after Acute and Chronic Lesion
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通过将粉末衍射和电子显微镜结合起来,解决了复杂的石结构.

Fabian Gramm1, Christian Baerlocher, Lynne B McCusker

  • 1Laboratory of Crystallography, ETH Zurich, 8093 Zurich, Switzerland.

Nature
|November 3, 2006
PubMed
概括

确定复杂的多晶材料的结构,如石是具有挑战性的. 将真实空间显微镜与像FOCUS这样的反向空间算法集成,可以解决更复杂的结构,正如西奥利特TNU-9.

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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.
  • 化学 化学 化学

背景情况:

  • 许多工业重要材料 (陶,催化剂,药品) 是多晶的,阻碍单晶生长,需要先进的结构分析.
  • 像电子显微镜和粉末衍射等传统方法在解决复杂结构方面面临局限性,原因是简单性约束或反射重叠.
  • 将化学信息纳入结构确定对于克服粉末衍射数据中的模糊性至关重要.

研究的目的:

  • 扩大对多晶材料结构确定的复杂度极限.
  • 为了证明将高分辨率传输电子显微镜 (HRTEM) 的实时空间相位信息与反向空间算法集成的有效性.
  • 通过这种增强的方法来解决热TNU-9的复杂结构.

主要方法:

  • 利用了FOCUS算法,该算法在真实空间和相互空间中运行.
  • 将高分辨率传输电子显微镜 (HRTEM) 图像的相位信息直接集成到FOCUS算法中.
  • 应用了增强的FOCUS算法来确定热带石TNU-9.9的结构.

主要成果:

  • 成功地解决了石TNU-9的复杂结构 (红色H9.3红色[Al9.3Si182.7O384]),其中包括24个不同的 (Si,Al) 位点和52个不同的O位点.
  • 与以前的方法相比,证明了结构确定复杂性极限的显著延伸.
  • TNU-9的已解决结构比以前最复杂的已知热岩,ITQ-22 (16个不同的 (Si,Ge) 位点) 复杂得多.

结论:

  • 将HRTEM相位信息集成到FOCUS算法中是一种用于解决复杂多晶材料结构的强大方法.
  • 这种方法显著提升了确定先进热石等具有挑战性的材料中的原子排列的能力.
  • TNU-9的成功结构解决方案验证了增强算法的未来材料发现和表征的潜力.