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Related Concept Videos

Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

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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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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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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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Quantitative Defect-Property Correlations in Ti3C2Tx MXenes via Precursor-Controlled Defect Engineering.

Tufail Hassan1, Doyeon Lee2, Shabbir Madad Naqvi1

  • 1School of Advanced Materials Science and Engineering, Sungkyunkwan University, Seobu-Ro 2066, Jangan-Gu, Suwon-Si, Gyeonggi-Do, 16419, Republic of Korea.

Nano-Micro Letters
|March 2, 2026
PubMed
Summary
This summary is machine-generated.

Researchers precisely controlled defects in Ti3C2Tx MXenes by adjusting precursor synthesis. This enabled quantitative correlations between defect density and material properties like conductivity and stability, leading to optimized MXene performance.

Keywords:
Defect engineeringDefect–property correlationMXenesOxidation resistanceVacancies and substitutions defects

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Chemistry

Background:

  • Defect engineering in MXenes is crucial for tuning multifunctional properties.
  • Quantitative links between MXene defects and performance are poorly understood due to challenges in controlling defect densities.
  • Existing methods lack precise control over defect concentrations in MXenes.

Purpose of the Study:

  • To develop a reliable strategy for precisely controlling defect densities in Ti3C2Tx MXenes.
  • To establish quantitative correlations between defect structure and multifunctional properties.
  • To fabricate MXenes with systematically controlled defects for performance optimization.

Main Methods:

  • Controlled synthesis of TiC precursors to adjust carbon stoichiometry.
  • Modified Ti3AlC2 MAX phase formation by varying aluminum content.
  • Fabrication of Ti3C2Tx MXenes with a range of defect densities.
  • Systematic characterization of defect densities and associated material properties.

Main Results:

  • Precisely controlled defect densities (vacancies, substitutional defects, lattice strain) in Ti3C2Tx MXenes.
  • Established quantitative correlations between defect density and electrical/thermal conductivity, infrared emissivity, electromagnetic shielding, Joule heating, and oxidation stability.
  • Achieved defect-minimized Ti3C2Tx MXene with exceptional properties: 26,000 S cm-1 electrical conductivity, 57 W m-1 K-1 thermal conductivity, 90.5 dB shielding effectiveness, 263 °C Joule heating, 0.05 infrared emissivity, and high oxidation resistance.

Conclusions:

  • A robust method for controlling MXene defect densities via precursor engineering was demonstrated.
  • A quantitative framework linking defect structure to MXene performance and stability was established.
  • The findings enable the design of MXenes with tailored properties for advanced applications.