Classical mobility of highly mobile crystal defects
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Updated: Apr 19, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
T D Swinburne1, S L Dudarev2, A P Sutton3
1Department of Physics, Imperial College London, Exhibition Road, London SW7 2AZ, United Kingdom and CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom.
Abstract:
Highly mobile crystal defects such as crowdions and prismatic dislocation loops exhibit an anomalous temperature independent mobility unexplained by phonon scattering analysis. Using a projection operator, without recourse to elasticity, we derive analytic expressions for the mobility of highly mobile defects and dislocations which may be efficiently evaluated in molecular dynamics simulation. The theory explains how a temperature-independent mobility arises because defect motion is not an eigenmode of the Hessian, an implicit assumption in all previous treatments.
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