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Related Concept Videos

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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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: Non-Stoichiometric Defects01:29

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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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Exploration of defect structures on graphene.

Shansheng Yu1, Weitao Zheng

  • 1Department of Materials Science, State Key Laboratory of Superhard Materials, and Key Laboratory of Automobile Materials, MOE, Jilin University, Changchun 130012, China.

Journal of Nanoscience and Nanotechnology
|May 8, 2013
PubMed
Summary
This summary is machine-generated.

Defects in chemical vapor deposition graphene, like carbon adatoms and vacancies, form strong bonds and alter electronic structures. These defects likely reduce graphene

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Chemical vapor deposition (CVD) graphene often exhibits structural defects.
  • Carbon feedstock atoms may contribute to graphene surface defects during annealing.

Purpose of the Study:

  • Investigate defect structures in graphene, specifically carbon adatom and vacancy adsorption.
  • Understand the impact of these defects on graphene's electronic properties.

Main Methods:

  • First-principles calculations were employed.
  • Simulations focused on adsorption energies and electronic structure modifications.

Main Results:

  • Carbon adatoms form strong covalent bonds with graphene.
  • C-C dimer adsorption is identified as a prevalent defect model.
  • Carbon adatoms can occupy graphene vacancies.
  • Defect structures cause splitting of the mid-gap peak in electronic structures.

Conclusions:

  • Observed defect structures explain reduced conductivity and charge carrier mobility in experimental graphene.
  • The findings provide insights into defect engineering for graphene applications.