Viscosity of glass-forming liquids

The low-temperature dynamics of ultraviscous liquids hold the key to understanding the nature of glass transition and relaxation phenomena, including the potential existence of an ideal thermodynamic glass transition. Unfortunately, existing viscosity models, such as the Vogel-Fulcher-Tammann (VFT)...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2009-11, Vol.106 (47), p.19780-19784
Main Authors: Mauro, John C, Yue, Yuanzheng, Ellison, Adam J, Gupta, Prabhat K, Allan, Douglas C
Format: Article
Language:English
Subjects:
Chemical composition
Entropy
Glass
Glass - chemistry
High temperature
Liquids
Low temperature
Mathematics
Modeling
Models, Theoretical
Parametric models
Phase transitions
Physical Sciences
Solutions - chemistry
Temperature
Temperature dependence
Thermodynamics
Viscosity
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Summary:The low-temperature dynamics of ultraviscous liquids hold the key to understanding the nature of glass transition and relaxation phenomena, including the potential existence of an ideal thermodynamic glass transition. Unfortunately, existing viscosity models, such as the Vogel-Fulcher-Tammann (VFT) and Avramov-Milchev (AM) equations, exhibit systematic error when extrapolating to low temperatures. We present a model offering an improved description of the viscosity-temperature relationship for both inorganic and organic liquids using the same number of parameters as VFT and AM. The model has a clear physical foundation based on the temperature dependence of configurational entropy, and it offers an accurate prediction of low-temperature isokoms without any singularity at finite temperature. Our results cast doubt on the existence of a Kauzmann entropy catastrophe and associated ideal glass transition.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.0911705106