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Related Concept Videos

Van der Waals Interactions01:24

Van der Waals Interactions

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Diffusion01:12

Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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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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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

143
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...
143
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

115
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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Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization
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Direct Visualization of Defect-Controlled Diffusion in van der Waals Gaps.

Joachim Dahl Thomsen1,2, Yaxian Wang3, Henrik Flyvbjerg4

  • 1Division of Physical Sciences, College of Letters and Science, University of California, Los Angeles, CL 90095, USA.

Advanced Materials (Deerfield Beach, Fla.)
|August 4, 2024
PubMed
Summary
This summary is machine-generated.

Diffusion in van der Waals materials is controlled by defects, influencing properties like intercalation. Controlling crystal quality allows tuning of diffusion dynamics for applications.

Keywords:
2D materialsDFT calculationsdiffusiontransmission electron microscopyvan der Waals heterostructures

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Science

Background:

  • Diffusion is crucial for phase transformations, doping, and intercalation in van der Waals (vdW) materials.
  • Understanding atomic diffusion dynamics at vdW interfaces is essential for materials design and device performance.

Purpose of the Study:

  • To quantify tungsten (W) atom diffusion dynamics at hexagonal boron nitride (BN)/vacuum, BN/BN, and BN/WSe2 interfaces.
  • To investigate the role of defects in W atom diffusion using advanced imaging and theoretical calculations.

Main Methods:

  • Quantified diffusion dynamics by recording scanning transmission electron microscopy (STEM) movies of individual W atom motion.
  • Utilized density functional theory (DFT) calculations to support experimental observations and understand diffusion mechanisms.

Main Results:

  • Identified intermittent trapping at electron beam-generated defect sites as the governing mechanism for W atom diffusion.
  • Demonstrated that diffusion properties are strongly dependent on the concentration of defects.
  • Observed diffusion behavior across different vdW interfaces, including BN/vacuum, BN/BN, and BN/WSe2.

Conclusions:

  • Diffusion and intercalation processes in vdW materials are highly tunable and sensitive to crystal quality.
  • High-resolution STEM imaging provides direct visualization of diffusion and atomic interactions in vdW heterostructures.
  • This technique enables in situ modification studies and correlative atomic resolution imaging with electrical property measurements.