Glass Dynamics Deep in the Energy Landscape

Ediger, M. D.; Gruebele, Martin; Lubchenko, Vassiliy; Wolynes, Peter G.

doi:10.1021/acs.jpcb.1c01739

Cited by 21 publications

(9 citation statements)

References 135 publications

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“…Over the past decade, considerable progress has been made deeper into the energy landscape, especially in a regime of ultrastable, low-energy glasses. Ediger et al, in a recently published perspective, point out that the glassy state seems to be rather heterogeneous in terms of local fictive temperature where the degree of local inhomogeneity depends on the preparation and aging history. On the other hand, the classical single fictive temperature TNM model is very useful for quench rate estimations of volcanic glasses .…”

Section: Discussionmentioning

confidence: 99%

Structural Relaxation Rate and Aging in Amorphous Solids

Málek

2023

J. Phys. Chem. C

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The structural relaxation in amorphous materials is discussed within the Tool−Narayanaswamy−Moynihan model (TNM), the Kovacs−Aklonis− Hutchinson−Ramos model (KAHR), and the entropy-based Adam−Gibbs− Scherer−Hodge model (AGSH). These three phenomenological models are most frequently used for the description of experimental structural relaxation data by a suitable set of parameters obtained by curve fitting. The parameter sets reported in the literature for 250 different amorphous material compositions are analyzed on the basis of the isothermal relaxation rate R depending on the nonexponentiality parameter β and the nonlinearity contribution, defined for the TNM, KAHR, and AGSH models as σ = −(dln τ/dT f ) i . The R 10 calculated at 10 K below T g represents a scale for the structural relaxation rate. It describes the structural relaxation kinetics in very different amorphous materials such as organic polymers, epoxy resins, sugars, hydrated starch, simple organic molecules, oxide glasses, chalcogenide glasses, halide glasses, metallic glasses, volcanic glasses, and tektite. This approach can be used for the kinetic comparison of structural relaxation behavior in different amorphous materials as well as in the assessment of the aging treatment and composition design for their future applications.

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Section: Discussionmentioning

confidence: 99%

Structural Relaxation Rate and Aging in Amorphous Solids

Málek

2023

J. Phys. Chem. C

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“…The fact that the lowest canyon energies observed approach the Kauzmann limit confirms that by avoiding being trapped, MIMSE can act like a global optimizer similar to basin hopping [36]. The presence of similar canyon-like features in these seemingly different systems, might explain the broad range of qualitatively similar physical properties and phenomenon in these systems [13,29,38].…”

Section: Discussionmentioning

confidence: 56%

“…Notably, once it finds its first zero-energy state, MIMSE finds a new, unbiased zero-energy state after every bias addition, and no finite energy ISes. The g(r) of these configurations on the z plateau resembles the jammed case for large r suggesting that the algorithm is sampling the landscape of the marginal glass adjacent to the jamming line [9,29].…”

Section: Hard Sphere Fluidmentioning

confidence: 93%

Exploring canyons in glassy energy landscapes using metadynamics

Amruthesh¹,

Riggleman²,

Crocker³

2022

Preprint

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The complex physics of glass forming systems is controlled by the structure of the low energy portions of their potential energy landscapes. Here, we report that a modified metadynamics algorithm efficiently explores and samples low energy regions of such high-dimensional landscapes. In the energy landscape for a model foam, metadynamics finds and descends meandering 'canyons' in the landscape, which contain dense clusters of energy minima along their floors. Similar canyon structures in the energy landscapes of two model glass formers-hard sphere fluids and the Kob-Andersen glass-allow metadynamics to reach low energies. In the hard sphere system, fluid configurations are found to form continuous regions that cover the canyon floors, but only up to a volume fraction close to that predicted for kinetic arrest. For the Kob-Andersen glass former, metadynamics reaches the canyons' ends with modest computational effort; with the lowest energies found approaching the predicted Kauzmann limit.

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“…With the structural disorder characteristic of a liquid and the restricted dynamics characteristic of a solid, glasses are optically transparent, highly processable, and grain-boundary-free materials that play an important role in many current and emerging technologies. − Glasses are critical components of displays, coatings, and building materials, and new glassy materials are being actively developed as solid electrolytes for batteries, storage media for radioactive waste, and matrices to isolate qubits for quantum computing . Though many inorganic, metallic, polymeric, and molecular organic materials can form glasses, , the compositional and structural diversity of glasses that have been designed, synthesized, and studied to date pales in comparison to crystalline materials.…”

Section: Introductionmentioning

confidence: 99%

Designing Glass and Crystalline Phases of Metal–Bis(acetamide) Networks to Promote High Optical Contrast

et al. 2022

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Owing to their high tunability and predictable structures, metal−organic materials offer a powerful platform to study glass formation and crystallization processes and to design glasses with unique properties. Here, we report a novel series of glass-forming metal−ethylenebis(acetamide) networks that undergo reversible glass and crystallization transitions below 200 °C. The glass-transition temperatures, crystallization kinetics, and glass stability of these materials are readily tunable, either by synthetic modification or by liquid-phase blending, to form binary glasses. Pair distribution function (PDF) analysis reveals extended structural correlations in both single and binary metal−bis-(acetamide) glasses and highlights the important role of metal− metal correlations during structural evolution across glass−crystal transitions. Notably, the glass and crystalline phases of a Co− ethylenebis(acetamide) binary network feature a large reflectivity contrast ratio of 4.8 that results from changes in the local coordination environment around Co centers. These results provide new insights into glass−crystal transitions in metal−organic materials and have exciting implications for optical switching, rewritable data storage, and functional glass ceramics.

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Glass Dynamics Deep in the Energy Landscape

Cited by 21 publications

References 135 publications

Structural Relaxation Rate and Aging in Amorphous Solids

Structural Relaxation Rate and Aging in Amorphous Solids

Exploring canyons in glassy energy landscapes using metadynamics

Designing Glass and Crystalline Phases of Metal–Bis(acetamide) Networks to Promote High Optical Contrast

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