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- W208081231 abstract "The degree of departure from Arrhenius temperature dependence of the relaxation time in the viscous liquid, thefragility, has in the course of the last decade been shown to (or suggested to) correlate with a large number of properties in the liquid and the corresponding glass. Here we develop a set of criteria for scrutinizing these types of correlations by introducing pressure as a control variable in addition to temperature. These criteria are used in the analysis of an extensive new set of data. We particularly study the width of the alpha relaxation by dielectric spectroscopy, the relative intensity of the boson peak and the mean square displacement by neutron scattering and the nonergodicity factor by inelastic X-ray scattering. In the study of the width of the alpha relaxation as well as the relative intensity of the boson peak we find that they do not relate to the effect of density on the relaxation time, and that a physically meaningful correlation in these cases should be a correlation to isochoric fragility rather than to the conventional isobaric fragility. The mean square displacement is found to relate to a balanced combination of temperature and density, while we suggest that the nonergodicity factor evaluated at Tg is correlated with the relative effect of density on the viscous slowing down." @default.
- W208081231 created "2016-06-24" @default.
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- W208081231 date "2007-01-01" @default.
- W208081231 modified "2023-09-23" @default.
- W208081231 title "Fast and slow dynamics of glass-forming liquids : what can we learn from high pressure experiments ?" @default.
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