High-frequency asymptotic shape of the primary relaxation in supercooled liquids
The James Franck Institute and The Department of Physics, The University
of Chicago - Chicago, IL 60637 USA
Accepted: 27 June 1997
We characterize the high-frequency asymptotic shape of the primary dielectric relaxation for four supercooled liquids: glycerol, propylene carbonate, D-propylene glycol and tricresyl phosphate. Two distinct power laws, with an exact relationship between their exponents, exist above the peak in the imaginary part of the permittivity, . The second power law is a robust feature of the spectra, extending at least 13 decades above the peak frequency, for all the liquids. The change with temperature of in this high-frequency region provides direct evidence for a proposed divergence in the static susceptibility in supercooled liquids and suggests that in the simplest analysis the approach to this divergence obeys Curie-Weiss behavior.
PACS: 77.22.Gm – Dielectric loss and relaxation / 64.60.-i – General studies of phase transitions / 64.70.Pf – Glass transitions
© EDP Sciences, 1997