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Author Richert, Ranko
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ♦ ACTIVATION ENERGY ♦ DIELECTRIC MATERIALS ♦ ELECTRIC FIELDS ♦ ENTROPY ♦ EXPERIMENTAL DATA ♦ NONLINEAR PROBLEMS ♦ NUMERICAL SOLUTION ♦ PARTICLE TRACKS ♦ TEMPERATURE DEPENDENCE ♦ TIME DEPENDENCE
Abstract A model of non-linear dielectric polarization is studied in which the field induced entropy change is the source of polarization dependent retardation time constants. Numerical solutions for the susceptibilities of the system are obtained for parameters that represent the dynamic and thermodynamic behavior of glycerol. The calculations for high amplitude sinusoidal fields show a significant enhancement of the steady state loss for frequencies below that of the low field loss peak. Also at relatively low frequencies, the third harmonic susceptibility spectrum shows a “hump,” i.e., a maximum, with an amplitude that increases with decreasing temperature. Both of these non-linear effects are consistent with experimental evidence. While such features have been used to conclude on a temperature dependent number of dynamically correlated particles, N{sub corr}, the present result demonstrates that the third harmonic susceptibility display a peak with an amplitude that tracks the variation of the activation energy in a model that does not involve dynamical correlations or spatial scales.
ISSN 00219606
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-03-21
Publisher Place United States
Journal Journal of Chemical Physics
Volume Number 144
Issue Number 11


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