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Common mechanism of thermodynamic and mechanical origin for ageing and crystallization of glasses.

ABSTRACT: The glassy state is known to undergo slow structural relaxation, where the system progressively explores lower free-energy minima which are either amorphous (ageing) or crystalline (devitrification). Recently, there is growing interest in the unusual intermittent collective displacements of a large number of particles known as 'avalanches'. However, their structural origin and dynamics are yet to be fully addressed. Here, we study hard-sphere glasses which either crystallize or age depending on the degree of size polydispersity, and show that a small number of particles are thermodynamically driven to rearrange in regions of low density and bond orientational order. This causes a transient loss of mechanical equilibrium which facilitates a large cascade of motion. Combined with previously identified phenomenology, we have a complete kinetic pathway for structural change which is common to both ageing and crystallization. Furthermore, this suggests that transient force balance is what distinguishes glasses from supercooled liquids.

SUBMITTER: Yanagishima T

PROVIDER: S-EPMC5493766 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

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Common mechanism of thermodynamic and mechanical origin for ageing and crystallization of glasses.

Yanagishima Taiki T Russo John J Tanaka Hajime H

Nature communications 20170629

The glassy state is known to undergo slow structural relaxation, where the system progressively explores lower free-energy minima which are either amorphous (ageing) or crystalline (devitrification). Recently, there is growing interest in the unusual intermittent collective displacements of a large number of particles known as 'avalanches'. However, their structural origin and dynamics are yet to be fully addressed. Here, we study hard-sphere glasses which either crystallize or age depending on ...[more]

PMID: 28660879

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Dataset Information

Common mechanism of thermodynamic and mechanical origin for ageing and crystallization of glasses.

Publications

Common mechanism of thermodynamic and mechanical origin for ageing and crystallization of glasses.

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