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Related Concept Videos

Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
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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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Boundary Conditions for Current Density01:25

Boundary Conditions for Current Density

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Current density becomes discontinuous across an interface of materials with different electrical conductivities. The normal component of the current density is continuous across the boundary.
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Carrier Transport01:21

Carrier Transport

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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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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...
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The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
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Updated: Mar 14, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Thermal conductivity of disordered two-dimensional binary alloys.

Yang Zhou1, Zhi-Xin Guo2, Hai-Yuan Cao1

  • 1Key Laboratory for Computational Physical Science (Ministry of Education), State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China. xggong@fudan.edu.cn and Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, Jiangsu, China.

Nanoscale
|October 8, 2016
PubMed
Summary

Disorder significantly impacts the thermal conductivity of two-dimensional (2D) carbon-nitrogen alloys, influencing phonon behavior. Thermal conductivity in these alloys correlates linearly with phonon participation and disorder degree.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Thermal conductivity is a crucial property for materials used in thermal management.
  • Understanding the influence of structural disorder on thermal transport in alloys is essential for designing advanced materials.

Purpose of the Study:

  • To investigate the effect of disorder on the thermal conductivity of two-dimensional (2D) C1-xNx alloys.
  • To establish relationships between thermal conductivity, material composition, and disorder distribution.

Main Methods:

  • Non-equilibrium molecular dynamics (NEMD) simulations were employed.
  • Phonon localization mode analysis was used to understand transport mechanisms.

Main Results:

  • Thermal conductivity depends on both nitrogen substitution concentration and disorder distribution.
  • A linear relationship was found between thermal conductivity and phonon participation ratio.
  • Disorder degree and substitution concentration can describe thermal conductivity variations in disordered alloys.

Conclusions:

  • Disorder plays a critical role in modulating thermal conductivity in 2D C1-xNx alloys.
  • The findings offer guidance for phonon manipulation and thermal engineering in low-dimensional alloys.