Effect of thermal fluctuations on the coarsening dynamics of 2D hexagonal system

Leopoldo R. Gómez, Enrique M. Vallés and Daniel A. Vega

Physica A: Statistical Mechanics and its Applications, 2007, vol. 386, issue 2, 648-654

Abstract: The dynamics of ordering in a 2D hexagonal system was investigated through the Cahn–Hilliard–Cook model. At low thermal noise amplitudes, pinning forces acting on grain boundaries dominate the dynamics and the coarsening evolves logarithmically in time. As noise amplitude increases, fluctuations becomes large enough to unlock dislocations located along grain boundaries and the grain boundary motion is driven by curvature. The grain boundary relaxation leads to a grain structure with Lifshitz's configurations. In this case the dynamic is also logarithmic as a consequence of the pinning of triple points.

Keywords: Coarsening; Lifshitz–Safran; Hexagonal phase (search for similar items in EconPapers)
Date: 2007
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:386:y:2007:i:2:p:648-654

DOI: 10.1016/j.physa.2007.08.056

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