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Related Concept Videos

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...
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 areĀ  scattered by the electron clouds around the sample atoms. TheĀ  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal crystal...
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

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...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...

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Related Experiment Video

Updated: May 8, 2026

Microfluidic Chips for In Situ Crystal X-ray Diffraction and In Situ Dynamic Light Scattering for Serial Crystallography
11:48

Microfluidic Chips for In Situ Crystal X-ray Diffraction and In Situ Dynamic Light Scattering for Serial Crystallography

Published on: April 24, 2018

Counting dislocations in microcrystals by coherent x-ray diffraction.

V L R Jacques1, D Carbone, R Ghisleni

  • 1European Synchrotron Radiation Facility, 6 rue Jules Horowitz, BP220, 38043 Grenoble Cedex, France. vincent.jacques@u-psud.fr

Physical Review Letters
|August 27, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed a new, nondestructive method to count dislocations in microcrystals using coherent X-ray diffraction and controlled compression. This breakthrough enables precise quantification of defects in small-scale systems.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Dislocations, or line defects, significantly influence the physical properties of microcrystals.
  • Accurate quantification of dislocations in microscale objects is crucial for understanding material behavior.
  • Existing techniques often lack the precision or are destructive for analyzing microcrystal defects.

Purpose of the Study:

  • To introduce a novel, nondestructive method for quantifying the number of dislocations in microcrystals.
  • To demonstrate the capability of the developed technique for precise defect detection and counting.
  • To establish a new tool for the study of materials with defect-dependent properties.

Main Methods:

  • Utilizing coherent X-ray diffraction as a localized probing technique.
  • Implementing controlled compression of micro-objects to facilitate defect analysis.
  • Combining these advanced methods for unprecedented quantification of microcrystal dislocations.

Main Results:

  • Successfully detected dislocations within microcrystals using the combined technique.
  • Precisely quantified the number of dislocations, achieving unprecedented accuracy.
  • Demonstrated the nondestructive nature of the developed method.

Conclusions:

  • The presented method offers a groundbreaking approach for quantifying microcrystal dislocations.
  • This technique overcomes limitations of existing methods, providing nondestructive analysis.
  • The approach is poised to become a critical tool for nanotechnology and the study of defect-dependent materials.