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Related Concept Videos

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: 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: 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...
Metallic Solids02:37

Metallic Solids

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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Carrier Generation and Recombination01:22

Carrier Generation and Recombination

Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...

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Related Experiment Video

Updated: May 8, 2026

Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization
07:50

Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization

Published on: July 17, 2015

Phase-Resolved Defect Transport Mechanisms Governing Asynchronous Ordering in a Eutectic High-Entropy Alloy.

Huiwen Yao1,2, Qingshuang Ma1,2, Jie Xiong3

  • 1School of Materials Science and Engineering, Northeastern University, Shenyang, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|May 7, 2026
PubMed
Summary
This summary is machine-generated.

Eutectic high-entropy alloys (EHEAs) show different phase changes due to unique defect behaviors. Understanding these mechanisms is key to designing stable complex alloys.

Keywords:
asynchronous orderingeutectic high‐entropy alloysphase‐resolved diffusionpoint defectvacancy‐interstitial cooperation

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Last Updated: May 8, 2026

Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization
07:50

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Published on: July 17, 2015

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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Area of Science:

  • Materials Science
  • Metallurgy
  • Solid-State Physics

Background:

  • Eutectic high-entropy alloys (EHEAs) display complex, asynchronous phase evolution during thermal treatment.
  • The fundamental mechanisms driving these differing phase transformations remain largely unexplored.

Purpose of the Study:

  • To elucidate the mechanisms behind the asynchronous phase evolution in EHEAs.
  • To investigate the isothermal annealing behavior of the AlCoCrCuFeNi alloy.

Main Methods:

  • Phase-resolved experimental techniques, including electron microscopy.
  • Atomistic simulations, such as molecular dynamics and Monte Carlo simulations.

Main Results:

  • Electron microscopy showed distinct structural pathways: BCC-FeCr developed long-range order, while B2-NiAl underwent local relaxation.
  • Simulations revealed phase-dependent defect energetics influencing transport mechanisms.
  • B2-NiAl exhibited efficient vacancy-mediated transport, whereas BCC-FeCr utilized a cooperative vacancy-interstitial mechanism.

Conclusions:

  • Heterogeneous defect transport mechanisms are responsible for asynchronous ordering in EHEAs.
  • This phase-resolved understanding provides a basis for designing thermally stable complex alloys.