Mechanisms of dielectric relaxation of hexagonal ice

Abstract

The article presents the results of theoretical and experimental studies of the dielectric relaxation of hexagonal ice in a wide temperature range. The model of dielectric relaxation of ice was developed explaining the origin of the dynamic crossovers in relaxation time at high and low temperatures. The results of the model are in agreement with experimental studies and explain the irreproducibility of dielectric experiments at low temperatures.

Advances in the Study of Gas Hydrates by Dielectric Spectroscopy

“…Therefore, above T ≈ 240 K, measurements give approximately the same values of τ. A detailed comparison of the experimental data for ice I h and an analysis of the different behaviors of the dynamic parameters at low temperatures are described in detail in the work [ 20 ].…”

“…For the hydrate samples with PVCap at a temperature of 246 K, a small break is observed, the nature of which is not yet clear and requires additional study. The decrease in the activation energy can be explained in terms of the competition between two types of relaxation, orientational and ionic [ 19 , 20 , 21 ]. If, for some reason, the structure of the hydrogen bond network changes in the system and protons become more mobile, this leads to an increase in the number of ionic defects and an increase in the contribution of the ionic relaxation mechanism.…”