Dielectric spectroscopy at high frequencies on glass forming liquids
- Univ. Augsburg (Germany). Experimentalphysik V.
- TH Darmstadt (Germany). Inst. fuer Festkoerperphysik
Dielectric spectroscopy up to 950 GHz has been performed on various glass formers as glycerol, propylene-carbonate, and Salol. Special attention is given to the dielectric loss, {epsilon}{double_prime}, in the crossover regime from the {alpha}-relaxation to the far-infrared (FIR) response where it can be directly compared to the dynamic susceptibilities obtained by neutron and light scattering techniques. The authors observe a minimum in {epsilon}{double_prime} ({nu}) at high frequencies which cannot be explained by a simple transition from {alpha}-relaxation peak to the FIR bands but has to be attributed to additional fast processes. In all materials investigated, {epsilon}{double_prime} ({nu}) increases significantly sublinear above the minimum. The ratio of the intensity of the {alpha}-process and the fast process as determined from the dielectric experiments is significantly higher compared to the results from the scattering experiments.
- OSTI ID:
- 580850
- Report Number(s):
- CONF-961202--; ISBN 1-55899-359-2
- Country of Publication:
- United States
- Language:
- English
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