2008/04/15 by M. Köhler, Mateus H. Köhler, P. Lunkenheimer +1
Chemical Engineering · Materials Science · Physics and Astronomy · #Ionic liquids properties and applications #Material Dynamics and Properties #Thermodynamic properties of mixtures #cond-mat.dis-nn #cond-mat.soft
paper · pdf · doi:10.1140/epje/i2008-10357-8
published as Euro. Phys. J. E 27, 115 (2008) · 8 pages, 7 figures
arxiv created 2008/04/15 · openalex publication_date 2008/08/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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.