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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: Stoichiometric Point Defects01:26

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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...
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...

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Related Experiment Video

Updated: Jun 14, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Periodic Structural Defects in Graphene Sheets Engineered via Electron Irradiation.

Nicola Melchioni1, Filippo Fabbri1, Alessandro Tredicucci2,3

  • 1NEST Laboratory, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, I-56127 Pisa, Italy.

Micromachines
|October 27, 2022
PubMed
Summary

Researchers precisely engineered graphene defects using low-energy electron beams, achieving nanometer-scale patterns. Substrate effects were modeled, enabling advanced graphene device fabrication for enhanced surface reactivity.

Keywords:
defect engineeringgraphenelow-energy electron irradiationsubstrate effects

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Area of Science:

  • Materials Science
  • Nanoscience
  • Condensed Matter Physics

Background:

  • Artificially induced defects in graphene lattices offer a route to engineer material properties.
  • Periodic arrays of defects are particularly promising for advanced applications.
  • Low-energy electron irradiation via scanning electron microscopy is a method for defect induction.

Purpose of the Study:

  • To investigate the achievable resolution of defect patterns created by low-energy electron irradiation in graphene.
  • To analyze the factors limiting pattern precision.
  • To develop a model accounting for substrate effects on defect generation.

Main Methods:

  • Utilized low-energy electron irradiation (<20 keV) in a scanning electron microscope to create defect patterns.
  • Employed atomic force microscopy and micro-Raman spectroscopy for precise characterization.
  • Developed a theoretical model to explain observed resolution limitations.

Main Results:

  • Demonstrated the creation of well-defined periodic defect patterns in graphene with precision in the tens of nanometers.
  • Identified back-scattered electrons from the substrate as a key factor limiting achievable resolution.
  • Validated a model that incorporates substrate effects to predict pattern characteristics.

Conclusions:

  • Precise defect engineering in graphene is achievable with low-energy electron irradiation, enabling nanometer-scale pattern fabrication.
  • Understanding and modeling substrate effects are crucial for optimizing resolution and designing graphene devices.
  • This work facilitates the accessible fabrication of graphene devices with complex defect structures for applications leveraging increased surface reactivity.