Dielectric and conductivity relaxation in mixtures of glycerol with LiCl |
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Authors: | M Köhler P Lunkenheimer A Loidl |
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Institution: | (1) Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany |
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Abstract: | We report a thorough dielectric characterization of the α relaxation of glass-forming glycerol with varying additions of LiCl.
Nine salt concentrations from 0.1 to 20mol% are investigated in a frequency range of 20Hz-3GHz 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. |
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Keywords: | PACS" target="_blank">PACS 64 70 pm Liquids 66 10 Ed Ionic conduction 77 22 Gm Dielectric loss and relaxation |
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