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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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Related Experiment Video

Updated: Jul 2, 2026

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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Restricted dislocation motion in crystals of colloidal dimer particles.

Sharon J Gerbode1, Stephanie H Lee, Chekesha M Liddell

  • 1Physics, Cornell University, Ithaca, NY 14853, USA.

Physical Review Letters
|September 4, 2008
PubMed
Summary

Dislocation glide in colloidal dimer crystals is hindered by specific particle orientations, impacting their material properties. These obstacles significantly alter how dislocations move and interact within the crystal structure.

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Related Experiment Videos

Last Updated: Jul 2, 2026

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Crystallography

Background:

  • Colloidal dimer particles form degenerate crystal (DC) structures at high area fractions.
  • In DCs, particle lobes occupy triangular lattice sites, with random particle orientations along lattice directions.

Purpose of the Study:

  • Investigate the phenomenon of dislocation glide in degenerate crystals.
  • Determine the impact of particle orientation on dislocation movement and crystal properties.

Main Methods:

  • Experimental observation of dislocation glide in DC grains.
  • Simulations of monocrystalline DCs to analyze dislocation behavior.
  • Estimation of energetic costs associated with dislocation reactions.

Main Results:

  • Dislocation glide in DCs is blocked by specific particle orientations.
  • The mean distance between these obstacles is experimentally measured as 4.6±0.2 lattice constants.
  • Simulations show a similar obstacle spacing of 6.18±0.01 lattice constants in monocrystalline DCs.
  • Dislocation propagation occurs via reactions beyond these obstacles.

Conclusions:

  • Certain particle orientations act as significant barriers to dislocation glide in DCs.
  • The energetic cost of separating dislocation pairs increases linearly with separation distance.
  • The material properties of DCs may differ substantially from two-dimensional crystals of spheres due to these effects.