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Anomalous Low-Frequency Dielectric Response of Clay-Water System

In this work we give the analysis of the low frequency dielectric response of selected kaolinitic clays at different water content ranging from dry, over plastic to liquid limit. For all samples investigated, depending on the moisture content, the real part of the dielectric function reflects the abnormal behaviour within the certain frequency region where the negative values of real part of dielectric response have been observed. The anomalies are explained within a generalized conductivity model based on the clay-water electrolyte ions free motion in pore water and their restricted motion near the clay particle surface. The results indicate that the dynamics of the ions in moist clay is in part governed by anomalous diffusion.