Theory of Structural Glasses and Supercooled Liquids

Lubchenko, Vassiliy; Wolynes, Peter G.

doi:10.1146/annurev.physchem.58.032806.104653

Cited by 791 publications

(1,082 citation statements)

References 83 publications

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“…A strong correlation among length scales is expected if glass formers are close enough to a putative thermodynamic critical point, whether avoided or unreachable [67]. This phenomenon is predicted for instance in weakly frustrated systems, as is possibly observed in some two-dimensional systems [9][10][11][13][14][15]17], and near a random first-order transition to an ideal glass [68].…”

Section: Discussionmentioning

confidence: 99%

Decorrelation of the static and dynamic length scales in hard-sphere glass formers

Charbonneau

Tarjus

2013

Phys. Rev. E

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We show that, in the equilibrium phase of glass-forming hard-sphere fluids in three dimensions, the static length scales tentatively associated with the dynamical slowdown and the dynamical length characterizing spatial heterogeneities in the dynamics unambiguously decorrelate. The former grow at a much slower rate than the latter when density increases. This observation is valid for the dynamical range that is accessible to computer simulations, which roughly corresponds to that accessible in colloidal experiments. We also find that, in this same range, no one-to-one correspondence between relaxation time and point-to-set correlation length exists. These results point to the coexistence of several relaxation mechanisms in the dynamically accessible regime of three-dimensional hard-sphere glass formers.

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Section: Discussionmentioning

confidence: 99%

Decorrelation of the static and dynamic length scales in hard-sphere glass formers

Charbonneau

Tarjus

2013

Phys. Rev. E

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“…Intensive work concentrated on the liquid-to-glass transition or slow down process 16,17 . However, the reverse glass-to-liquid transition (GLT) process as well as its structural origin has not been paid enough attention.…”

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confidence: 99%

Evolution of hidden localized flow during glass-to-liquid transition in metallic glass

et al. 2014

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For glasses, the structural origin of their flow phenomena, such as elastic and plastic deformations especially the microscopic hidden flow before yield and glass-to-liquid transition (GLT), is unclear yet due to the lack of structural information. Here we investigate the evolution of the microscopic localized flow during GLT in a prototypical metallic glass combining with dynamical mechanical relaxations, temperature-dependent tensile experiments and stress relaxation spectra. We show that the unstable and high mobility nano-scale liquid-like regions acting as flow units persist in the glass and can be activated by either temperature or external stress. The activation of such flow units is initially reversible and correlated with b-relaxation. As the proportion of the flow units reaches a critical percolation value, a mechanical brittle-to-ductile transition or macroscopic GLT happens. A comprehensive picture on the hidden flow as well as its correlation with deformation maps and relaxation spectrum is proposed.

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“…While important progress has been made in the understanding of the dynamics of glass-forming liquids [10][11][12][13] , a microscopic theory of glasses is still missing due to the extreme difficulty of probing the structural relaxation of a glass far below T g , either with experiments or simulations [13][14][15][16][17] .…”

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confidence: 99%

Revealing the fast atomic motion of network glasses

Baldi²,

et al. 2014

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Still very little is known on the relaxation dynamics of glasses at the microscopic level due to the lack of experiments and theories. It is commonly believed that glasses are in a dynamical arrested state, with relaxation times too large to be observed on human time scales. Here we provide the experimental evidence that glasses display fast atomic rearrangements within a few minutes, even in the deep glassy state. Following the evolution of the structural relaxation in a sodium silicate glass, we find that this fast dynamics is accompanied by the absence of any detectable aging, suggesting a decoupling of the relaxation time and the viscosity in the glass. The relaxation time is strongly affected by the network structure with a marked increase at the mesoscopic scale associated with the ion-conducting pathways. Our results modify the conception of the glassy state and asks for a new microscopic theory.

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Theory of Structural Glasses and Supercooled Liquids

Cited by 791 publications

References 83 publications

Decorrelation of the static and dynamic length scales in hard-sphere glass formers

Decorrelation of the static and dynamic length scales in hard-sphere glass formers

Evolution of hidden localized flow during glass-to-liquid transition in metallic glass

Revealing the fast atomic motion of network glasses

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