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Related Concept Videos

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...
50
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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Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

31
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...
31
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

14.3K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
14.3K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.9K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells
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Left-right correlation in coupled F-center defects.

Benjamin G Janesko1

  • 1Department of Chemistry & Biochemistry, Texas Christian University, 2800 S. University Dr., Fort Worth, Texas 76129, USA.

The Journal of Chemical Physics
|August 8, 2016
PubMed
Summary

Adjacent F-center defects in lithium fluoride exhibit strong electron correlation, impacting UV/visible absorption spectra. Standard approximations may fail for these correlated crystal defects.

Area of Science:

  • Solid State Physics
  • Quantum Chemistry
  • Materials Science

Background:

  • Left-right correlation is a key challenge in electronic structure theory.
  • F-centers are classic point defects in ionic crystals.
  • Understanding electron behavior in defects is crucial for materials properties.

Purpose of the Study:

  • To investigate the manifestation of left-right correlation in adjacent F-center defects.
  • To assess the impact of electron correlation on the optical properties of F-centers.
  • To evaluate the suitability of standard theoretical methods for correlated defect systems.

Main Methods:

  • Electronic structure calculations were performed on lithium fluoride with adjacent F-centers.
  • Simulations of UV/visible absorption spectra were conducted.

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  • Comparison with experimental data and theoretical models for single F-centers.

    • Main Results:

    • Adjacent F-centers in lithium fluoride exhibit strong left-right electron correlation.
    • This correlation is analogous to that found in stretched H2 molecules.
    • Simulations of UV/visible absorption spectra require inclusion of electron correlation to match experimental results.

    Conclusions:

    • Adjacent F-centers present a well-behaved yet challenging system for testing electronic structure methods.
    • Approximations successful for single F-centers may be inadequate for adjacent defect pairs.
    • The findings are relevant for both electronic structure theorists and crystal defect researchers.