Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-04-15
Euro. Phys. J. E 27, 115 (2008)
Physics
Condensed Matter
Soft Condensed Matter
8 pages, 7 figures
Scientific paper
10.1140/epje/i2008-10357-8
We report a thorough dielectric characterization of the alpha relaxation of glass forming glycerol with varying additions of LiCl. Nine salt concentrations from 0.1 - 20 mol% are investigated in a frequency range of 20 Hz - 3 GHz and analyzed in the dielectric loss and modulus representation. Information on the dc conductivity, the dielectric relaxation time (from the loss) and the conductivity relaxation time (from the modulus) is provided. Overall, with increasing ion concentration, a transition from reorientationally to translationally dominated behavior is observed and the translational ion dynamics and the dipolar reorientational dynamics become successively coupled. This gives rise to the prospect that by adding ions to dipolar glass formers, dielectric spectroscopy may directly couple to the translational degrees of freedom determining the glass transition, even in frequency regimes where usually strong decoupling is observed.
Köhler Manuel
Loidl Alois
Lunkenheimer P.
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