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Related Experiment Video

Updated: Apr 12, 2026

Atomically Traceable Nanostructure Fabrication

Atomically Traceable Nanostructure Fabrication

Published on: July 17, 2015

Measuring surface dislocation nucleation in defect-scarce nanostructures.

Lisa Y Chen¹, Mo-rigen He¹, Jungho Shin¹

¹Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

Nature Materials

|May 19, 2015

Summary

This summary is machine-generated.

Researchers directly measured dislocation nucleation strength in palladium nanowhiskers. They discovered a significant temperature dependence, indicating thermal fluctuations assist nucleation and explaining material strength variations.

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

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

Published on: July 17, 2020

Area of Science:

Materials Science
Solid Mechanics
Nanotechnology

Background:

Dislocations, or linear defects in crystals, are fundamental to understanding material plastic deformation and mechanical properties.
Direct measurement of dislocation nucleation energetics and kinetics has been challenging due to difficulties in synthesizing and testing defect-free crystals.

Purpose of the Study:

To directly measure the surface dislocation nucleation strengths in high-quality palladium (Pd) nanowhiskers under uniaxial tension.
To investigate the size, strain-rate, and temperature dependencies of dislocation nucleation.
To elucidate the role of thermal fluctuations in the nucleation process.

Main Methods:

Experiments were conducted on high-quality 〈110〉 palladium nanowhiskers subjected to uniaxial tensile stress.
Surface dislocation nucleation strengths were directly measured.
Atomic-scale activation volumes were determined to analyze strength dependencies.

Main Results:

Dislocation nucleation strengths exhibited weak dependence on nanowhisker size and strain rate.
A strong temperature dependence was observed, supporting the role of thermal fluctuations in nucleation.
Measured atomic-scale activation volumes explained both ultrahigh athermal strength and temperature-dependent strength scatter.

Conclusions:

The study provides the first direct measurements of surface dislocation nucleation strength.
Thermal fluctuations significantly assist dislocation nucleation, influencing material mechanical behavior.
The findings offer insights into the fundamental mechanisms governing the strength and deformation of crystalline materials.