Ultrafast spherulitic crystal growth as a stress-induced phenomenon specific of fragile glass-formers

We propose a model for the abrupt emergence, below temperatures close to the glass transition, of the ultrafast (glass-to-crystal) steady mode of spherulitic crystal growth in deeply undercooled liquids. We interpret this phenomenon as controlled by the interplay between the generation of stresses b...

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Published in:The Journal of chemical physics 2012-09, Vol.137 (11), p.114506-114506
Main Authors: Caroli, Christiane, Lemaître, Anaël
Format: Article
Language:English
Subjects:
Condensed Matter
Crystal growth
Crystallization
Emergence
Fragility
Glass transition
Hysteresis
Liquids
Materials Science
Physics
Spherulites
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description We propose a model for the abrupt emergence, below temperatures close to the glass transition, of the ultrafast (glass-to-crystal) steady mode of spherulitic crystal growth in deeply undercooled liquids. We interpret this phenomenon as controlled by the interplay between the generation of stresses by crystallization and their partial release by flow in the surrounding amorphous visco-elastic matrix. Our model is consistent with both the observed ratios (∼10(4)) of fast-to-slow velocities and the fact that fast growth emerges close to the glass transition. It leads us to conclude that the existence of a fast growth regime requires both (i) a high fragility of the glassformer; (ii) the fine sub-structure specific of spherulites. It finally predicts that the transition is hysteretic, thus allowing for an independent experimental test.
doi_str_mv 10.1063/1.4753976
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subjects Condensed Matter
Crystal growth
Crystallization
Emergence
Fragility
Glass transition
Hysteresis
Liquids
Materials Science
Physics
Spherulites
title Ultrafast spherulitic crystal growth as a stress-induced phenomenon specific of fragile glass-formers
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