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The instantaneous shear modulus in the shoving model

Jeppe C Dyre¹, Wei Hua Wang

¹DNRF Centre Glass and Time, IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark. dyre@ruc.dk

The Journal of Chemical Physics

|June 21, 2012

Summary

The shoving model

Area of Science:

Materials Science
Condensed Matter Physics

Background:

Understanding the temperature dependence of viscous liquid relaxation times is crucial.
The shoving model offers a framework for this non-Arrhenius behavior.

Purpose of the Study:

To clarify the physical meaning of the instantaneous shear modulus G(∞) in the shoving model.
To compare experimental data of metallic glasses with different versions of the shoving model.

Main Methods:

Analysis of the shoving model's instantaneous shear modulus G(∞).
Comparison of model predictions with experimental data for metallic glasses.
Evaluation of shear-modulus and energy-landscape formulations of the shoving model.

Main Results:

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The instantaneous shear modulus G(∞) corresponds to the experimentally measurable high-frequency plateau modulus.

The original shoving model showed a correlation with the Poisson ratio.

The energy-landscape formulation eliminated this correlation, with the bulk modulus playing a minor role.

Conclusions:

The high-frequency plateau modulus is the relevant parameter for the shoving model.
The energy-landscape formulation provides a more robust description of viscous liquid dynamics in metallic glasses.
This work refines the application of the shoving model to understand material properties.