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The Scaling of Relaxation Processes—Revisited

  • Friedrich Kremer
  • Alois Loidl
Chapter
Part of the Advances in Dielectrics book series (ADVDIELECT)

Abstract

Glassy dynamics covers the extraordinary spectral range from 10+13 to 10−3 Hz and below. In this broad frequency window, four different dynamic processes take place: (i) the primary or α-relaxation, (ii) (slow) secondary relaxations (β-relaxations), (iii) fast absorption processes in the GHz and (iv) the boson-peak in the THz range. The dynamic glass transition is assigned to fluctuations between structural substates and scales well with the calorimetric glass transition temperature. It shows a similar temperature dependence as the viscosity and fluctuations of the density or heat capacity. The temperature dependence of the mean relaxation rate of the dynamic glass transition follows at first glance the empirical Vogel–Fulcher–Tammann law, albeit a further analysis unravels clear-cut deviations. The (slow) secondary relaxations are assigned to librational relaxations of molecular subgroups hence having a straightforward molecular assignment. They may also show up as a wing on the high-frequency side of the dynamic glass transition. The fast absorption processes at GHz frequencies can formally be described within the framework of the mode-coupling theory (MCT). The boson-peak resembles the Poley absorption and originates from overdamped oscillations. In this chapter, especially the first three contributions will be discussed in detail and compared with existing theoretical models.

Notes

Acknowledgements

Support by M. Anton in preparing some of the figures is highly acknowledged.

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© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Molekülphysik, Peter-Debye-Institut für Physik der weichen MaterieUniversität LeipzigLeipzigGermany
  2. 2.University of Augsburg, Experimental Physics VAugsburgGermany

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