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Related Concept Videos

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 Samples01:10

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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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Interference and Diffraction02:18

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

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A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
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Intrinsically Disordered Proteins02:18

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Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
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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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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering
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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

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Diffuse scattering and partial disorder in complex structures.

T R Welberry1, D J Goossens1

  • 1Research School of Chemistry, Australian National University , Canberra, ACT 0200, Australia.

Iucrj
|December 9, 2014
PubMed
Summary
This summary is machine-generated.

Single-crystal diffuse scattering (SCDS) reveals local atomic ordering crucial for understanding material function. Advanced synchrotron techniques enable detailed 3D analysis, advancing structure-property relationship studies.

Keywords:
disordersingle-crystal diffuse scatteringsynchrotron light sources

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Area of Science:

  • X-ray crystallography
  • Materials science
  • Solid-state physics

Background:

  • Single-crystal diffuse scattering (SCDS) has a long history in X-ray crystallography.
  • SCDS provides insights into local (short-range) ordering within materials.
  • Understanding local ordering is key to correlating material structure with its function.

Purpose of the Study:

  • To review the current state of single-crystal diffuse scattering (SCDS) techniques.
  • To discuss advancements in detectors, data collection, and modeling methods for SCDS.
  • To highlight the potential of SCDS for detailed structural analysis.

Main Methods:

  • Review of SCDS principles and historical context.
  • Discussion of modern detectors and data collection strategies at synchrotron sources.
  • Overview of Monte Carlo and ab initio modeling techniques for SCDS data.

Main Results:

  • High-quality, three-dimensional SCDS data can now be collected.
  • Advanced data collection enables more detailed and quantitative analyses.
  • New approaches like 3D pair distribution function (3D-PDF) studies are enabled.

Conclusions:

  • SCDS is a powerful tool for probing local atomic arrangements.
  • Synchrotron-based SCDS facilitates advanced structural investigations.
  • Techniques like 3D-PDF and automated disorder modeling benefit from high-quality SCDS data.