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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

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

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...
Carrier Transport01:21

Carrier Transport

The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
Bewley Lattice Diagram01:12

Bewley Lattice Diagram

The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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...

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Related Experiment Video

Updated: May 14, 2026

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
06:57

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon

Published on: July 17, 2020

Transport on a lattice with dynamical defects.

Francesco Turci1, Andrea Parmeggiani, Estelle Pitard

  • 1Laboratoire Charles Coulomb, Université Montpellier 2 and CNRS, 34095 Montpellier, Cedex 5, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 16, 2013
PubMed
Summary
This summary is machine-generated.

Transport dynamics on fluctuating biological substrates are influenced by localized dynamical sites. These defects create intermittent currents and significant finite-size effects, impacting biological and general transport processes.

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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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Probing Structural and Dynamic Properties of Trafficking Subcellular Nanostructures by Spatiotemporal Fluctuation Spectroscopy
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Related Experiment Videos

Last Updated: May 14, 2026

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
06:57

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon

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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

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Probing Structural and Dynamic Properties of Trafficking Subcellular Nanostructures by Spatiotemporal Fluctuation Spectroscopy
08:17

Probing Structural and Dynamic Properties of Trafficking Subcellular Nanostructures by Spatiotemporal Fluctuation Spectroscopy

Published on: August 16, 2021

Area of Science:

  • Physics
  • Biophysics
  • Statistical Mechanics

Background:

  • Transport processes in nature often occur on dynamic, unidimensional substrates.
  • Biological systems exhibit coupled substrate dynamics and active macromolecular motion (e.g., motor proteins, ribosomes).
  • These interactions lead to complex and novel transport phenomena.

Purpose of the Study:

  • To introduce a model of localized dynamical sites coupled with driven lattice gas dynamics.
  • To investigate the impact of these dynamical defects on transport phenomena.
  • To explore the regulatory role of defects in biological and general transport contexts.

Main Methods:

  • Development of a theoretical model incorporating localized dynamical sites.
  • Coupling these sites to driven lattice gas dynamics.
  • Analysis of transport phenomenology, focusing on current and finite-size effects.

Main Results:

  • Identification of a transport regime characterized by intermittent current.
  • Observation of severe finite-size effects due to dynamical defects.
  • Demonstration of a regulatory role for dynamical defects in transport.

Conclusions:

  • Localized dynamical sites significantly impact transport processes on substrates.
  • The interplay between substrate dynamics and particle motion creates complex transport behaviors.
  • Findings have implications for understanding biological transport and broader physical systems.