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During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis. 
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Updated: Feb 18, 2026

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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Dislocation nucleation facilitated by atomic segregation.

Lianfeng Zou1, Chaoming Yang2, Yinkai Lei3

  • 1Department of Mechanical Engineering & Materials Science and Engineering Program, State University of New York at Binghamton, New York 13902, USA.

Nature Materials
|November 29, 2017
PubMed
Summary
This summary is machine-generated.

Surface segregation in materials like Cu-Au causes strain and subsurface dislocations. These ordered surface regions block dislocation movement, revealing atomic mechanisms of dislocation behavior at elevated temperatures.

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Area of Science:

  • Materials Science
  • Surface Science
  • Solid-State Physics

Background:

  • Surface segregation, the enrichment of an element at the material surface relative to the bulk, is a common phenomenon in multi-component materials.
  • Understanding surface segregation is crucial for controlling material properties and performance.

Purpose of the Study:

  • To investigate the interplay between surface segregation, strain, and dislocation dynamics in a Cu-Au solid solution.
  • To elucidate the atomic-scale mechanisms of dislocation nucleation, migration, and annihilation at surfaces and interfaces.

Main Methods:

  • Dynamic, atomic-scale resolution electron microscopy for real-time observation.
  • Theoretical modeling to complement experimental findings and understand atomic processes.

Main Results:

  • Surface segregation in Cu-Au induces misfit strain and subsurface dislocation formation through surface diffusion and trapping.
  • Chemically ordered surface regions act as barriers, inhibiting dislocation annihilation at free surfaces.
  • Dislocations exhibit high activity, with detailed atomic mechanisms for nucleation, glide, climb, and annihilation at elevated temperatures identified.

Conclusions:

  • Surface segregation significantly influences subsurface defect behavior and material properties.
  • The study provides critical mechanistic insights into dislocation dynamics at interfaces, relevant for designing advanced materials.