The dynamic susceptibility in glass forming molecular liquids: the search for universal relaxation patterns II

The Journal of Chemical Physics
T BlochowiczE A Rössler

Abstract

The susceptibility spectra of ten molecular glass formers are completely interpolated by an extension of the generalized gamma distribution of correlation times. The data cover at least 15 decades in frequency and the interpolation includes both alpha peak and excess wing. It is shown that the line shape parameters and the time constant of the alpha relaxation are related to each other. Master curves are identified by a scaling procedure that involves only three parameters, namely, the glass transition temperature T(g), the fragility m, and the excess wing exponent at T(g). This holds independent of whether a further secondary relaxation peak is present or not. Above a crossover temperature T(x) this unique evolution of the line shape parameters breaks down, and a crossover to a simple peak susceptibility without excess wing is observed. Here, the frequency-temperature superposition principle holds in good approximation up to temperatures well above the melting point. It turns out that the crossover coincides with the temperature at which the low-temperature Vogel-Fulcher law starts to fail upon heating. Thus, the so-called Stickel temperature gets a more physical meaning as it marks a qualitative change in the evolution of the...Continue Reading

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Citations

Oct 2, 2009·Journal of Biological Physics·B VargaM T F Telling
Jan 1, 2009·Nature Physics·Jacob D Stevenson, Peter G Wolynes
Oct 15, 2013·The Journal of Chemical Physics·R KahlauE A Rössler
Jun 3, 2009·The Journal of Chemical Physics·Zeming ChenLi-Min Wang
Sep 1, 2006·The Journal of Chemical Physics·Li-Min WangRanko Richert
Nov 18, 2009·The Journal of Chemical Physics·Catalin GainaruRoland Böhmer
Aug 18, 2012·The Journal of Chemical Physics·Julio Cesar Martinez-GarciaJürg Hulliger
Apr 25, 2009·The Journal of Chemical Physics·Albena I NielsenJeppe C Dyre
Jan 20, 2011·The Journal of Physical Chemistry. B·D KrukE A Rössler
Sep 20, 2006·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Alexander Brodin, Ernst A Rössler
Jan 15, 2007·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Kristine NissChristiane Alba-Simionesco
Mar 10, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·R KahlauE A Rössler
Dec 17, 2019·Soft Matter·Valeriy V Ginzburg
Dec 24, 2018·The Journal of Chemical Physics·Kristine Niss, Tina Hecksher
Nov 13, 2007·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·C Dalle-FerrierG Tarjus
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Apr 9, 2021·The Journal of Physical Chemistry Letters·Florian PabstThomas Blochowicz
Jul 10, 2021·The Journal of Chemical Physics·Lisa Anita RoedBirte Riechers
May 2, 2012·Progress in Nuclear Magnetic Resonance Spectroscopy·D KrukE A Rössler

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