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Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....

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Updated: Nov 1, 2025

Evaluating Plasmonic Transport in Current-carrying Silver Nanowires

Evaluating Plasmonic Transport in Current-carrying Silver Nanowires

Published on: December 11, 2013

Fast Surface Dynamics on a Metallic Glass Nanowire.

Debaditya Chatterjee¹, Ajay Annamareddy¹, Jittisa Ketkaew²

¹Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.

|June 21, 2021

Summary

Surface dynamics of metallic glasses are faster than bulk dynamics, with a suppressed glass transition temperature. Coating the surface with amorphous carbon or a binding layer arrests these enhanced dynamics, revealing insights into atomic mobility.

Keywords:

electron correlation microscopy metallic glass molecular dynamics simulations surface dynamics transport mechanisms

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Last Updated: Nov 1, 2025

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Area of Science:

Materials Science
Condensed Matter Physics
Surface Science

Background:

Surface dynamics in glasses can significantly differ from bulk behavior, often exhibiting accelerated motion.
Understanding these surface dynamics is crucial for applications involving thin films and interfaces.

Purpose of the Study:

To investigate the surface dynamics of a platinum-based metallic glass using high-resolution electron correlation microscopy.
To quantify the suppression of the glass transition temperature at the surface and the effect of surface coatings on dynamics.

Main Methods:

Utilized electron correlation microscopy with sub-nanometer resolution to probe surface dynamics.
Performed parallel molecular dynamics simulations on Ni80P20 to complement experimental findings.
Investigated the impact of amorphous carbon coatings and chemically binding capping layers on surface dynamics.

Main Results:

Observed an approximately 20 K suppression of the glass transition temperature at the metallic glass surface.
Demonstrated that a thin amorphous carbon coating suppresses the enhanced surface dynamics.
Molecular dynamics simulations confirmed the temperature suppression and showed that a chemically binding capping layer arrests enhanced surface dynamics.
Identified atomic caging and hopping as mechanisms for near-surface mobility, correlated with cage-breaking barriers and cooperative stringlike motion.

Conclusions:

Surface dynamics in metallic glasses are significantly enhanced compared to the bulk, evidenced by a lower glass transition temperature.
Surface coatings, particularly those that chemically bind, can effectively arrest these enhanced dynamics.
The findings provide fundamental insights into the mechanisms governing atomic mobility at glass surfaces and interfaces.