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Related Concept Videos

Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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: May 7, 2026

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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Extended interplanar linking in graphite formed from vacancy aggregates.

T Trevethan1, P Dyulgerova, C D Latham

  • 1Department of Chemistry, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom.

Physical Review Letters
|September 17, 2013
PubMed
Summary
This summary is machine-generated.

Researchers discovered a new defect in graphite and graphene structures that links adjacent layers using only hexagonal sp2 bonding. This defect, potentially formed from vacancy aggregation, impacts material properties and can be identified via transmission electron microscopy.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Mechanical and electrical properties of graphite and graphene are sensitive to lattice defects.
  • Defects linking adjacent layers significantly influence material characteristics.
  • Understanding these defects is crucial for optimizing material performance.

Purpose of the Study:

  • To investigate a novel type of defect in graphite and graphene structures.
  • To explore the formation mechanism of this defect via vacancy aggregation.
  • To analyze the impact of this defect on material properties.

Main Methods:

  • Atomistic density functional theory calculations were used to study defect energetics and kinetics.
  • Simulations of high-resolution transmission electron microscopy (HRTEM) images were performed.
  • Computational results were compared with experimental images of irradiated graphite.

Main Results:

  • Evidence suggests a new defect type connecting adjacent graphite/graphene planes via continuous hexagonal sp2 bonding.
  • This defect can form through the aggregation of individual vacancy defects.
  • Simulated HRTEM images match experimental observations of electron-irradiated graphite.

Conclusions:

  • A novel interlayer defect in graphite and graphene has been identified and characterized.
  • The formation pathway through vacancy aggregation is computationally supported.
  • This finding provides new insights into defect-induced property changes in layered materials.