Is the configurational entropic model able to predict the final equilibrium state reached by Se glasses after very long ageing durations?. Grenet, J., Bouthegourd, E., Esposito, A., Saiter, A., & Saiter, J. Philosophical Magazine, 93(22):2932–2946, August, 2013. ![Is the configurational entropic model able to predict the final equilibrium state reached by Se glasses after very long ageing durations? [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex This work compares the equilibrium states reached by glassy selenium (g-Se) after several ageing durations at temperatures lower than the glass transition temperature T g, with the forecasts given by the configurational entropic model. The comparison is carried out through experimental data collected both on glassy samples after short-term ageing and on glassy samples older than 20 years, kept at room temperature. It is shown that the configurational entropic model is not able to describe the behaviour of g-Se, both at short- and long-ageing terms with the same set of fitting parameters. For short-term ageing, the forecasts given by the entropic model are in good agreement with the experimental data; the hypothesis that the heat capacities corresponding to the equilibrium state and to the state extrapolated from the liquid differ by an amount δ is therefore properly justified. For long-term ageing, the amount δ vanishes and the assumption does not hold any longer. Indeed, experimental results support the idea that at least two separate mechanisms of relaxation coexist in the physical ageing of g-Se, one with very fast kinetics and the other with much slower kinetics.
@article{grenet_is_2013,
title = {Is the configurational entropic model able to predict the final equilibrium state reached by {Se} glasses after very long ageing durations?},
volume = {93},
issn = {1478-6435},
url = {http://dx.doi.org/10.1080/14786435.2013.793482},
doi = {10.1080/14786435.2013.793482},
abstract = {This work compares the equilibrium states reached by glassy selenium (g-Se) after several ageing durations at temperatures lower than the glass transition temperature T g, with the forecasts given by the configurational entropic model. The comparison is carried out through experimental data collected both on glassy samples after short-term ageing and on glassy samples older than 20 years, kept at room temperature. It is shown that the configurational entropic model is not able to describe the behaviour of g-Se, both at short- and long-ageing terms with the same set of fitting parameters. For short-term ageing, the forecasts given by the entropic model are in good agreement with the experimental data; the hypothesis that the heat capacities corresponding to the equilibrium state and to the state extrapolated from the liquid differ by an amount δ is therefore properly justified. For long-term ageing, the amount δ vanishes and the assumption does not hold any longer. Indeed, experimental results support the idea that at least two separate mechanisms of relaxation coexist in the physical ageing of g-Se, one with very fast kinetics and the other with much slower kinetics.},
number = {22},
urldate = {2014-12-17},
journal = {Philosophical Magazine},
author = {Grenet, J. and Bouthegourd, E. and Esposito, A. and Saiter, A. and Saiter, J.M.},
month = aug,
year = {2013},
pages = {2932--2946}
}
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