Issue |
Europhys. Lett.
Volume 33, Number 8, March II 1996
|
|
---|---|---|
Page(s) | 611 - 616 | |
Section | Condensed matter: structure, thermal and mechanical properties | |
DOI | https://doi.org/10.1209/epl/i1996-00387-4 | |
Published online | 01 September 2002 |
High-frequency dielectric spectroscopy on glycerol
Institut für
Festkörperphysik, Technische Hochschule Darmstadt D-64289 Darmstadt,
Germany
Received:
15
June
1995
Accepted:
22
January
1996
Dielectric spectroscopy has been performed on supercooled glycerol for
frequencies Hz
GHz and temperatures between
. Hence, the absorptive part of the dielectric susceptibility
was measured at comparable frequencies as the dynamic susceptibility obtained by
neutron and light scattering techniques. The characteristic timescales obtained
from all experimental techniques essentially agree. However, the dielectric data
as measured on the high-frequency wing of the loss spectra are not consistent
with neutron and light scattering results which probe density fluctuations. We
conclude that in glycerol at high frequencies the density fluctuations are
dominated by local vibration excitations which are fully decoupled from the
dipolar reorientations. The temperature dependence of the dielectric loss traces
that of the spin-lattice relaxation times measured with NMR techniques and
exhibits almost frequency-independent signatures near the calorimetric glass
transition.
PACS: 64.70.Pf – Glass transitions / 77.22.Gm – Dielectric loss and relaxation
© EDP Sciences, 1996
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