Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 307, Issue -, Pages 356-363Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0022-3093(02)01496-5
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Broadband dielectric measurements for 60, 65, 70, 80, and 100 wt% glycerol-water mixtures were performed in the frequency range of 10 muHz-30 GHz and in the temperature range of 148-298 K. In the lower temperature range, the separation of the beta- and alpha-processes occurred for all the mixtures. The relaxation strength of the alpha-process below the separation temperature exhibits a maximum at a mole fraction of water, x(w) congruent to 0.55, and the relaxation strength of the beta-process increases with increasing x(w). In our previous study, the concentration dependence of the dielectric behavior of the alcohol-water mixtures at 25 degreesC was interpreted using a cooperative domain (CD), in which the re-orientation of molecules occurred cooperatively. The concentration dependence of the dielectric behavior for the glycerol-water mixtures is interpreted using a CD model. (C) 2002 Elsevier Science B.V. All rights reserved.
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