Electrophysical Properties of Natural Armenian and Syrian Zeolites

Using an experimental arrangement, designed and constructed locally, the electric permittivity ε=ε’-iε”, alternative current (a.c.) conductivity ζac and direct current (dc) conductivity ζdc of natural Syrian and Armenian zeolites are investigated in order to understand the mechanism of electrical conductivity in these materials. We also study the frequency dependence of angle tangents (tanδ=ε”/ε’) of dielectric losses of studied zeolitic samples. The mentioned measuring arrangement has a configuration of an electrical bridge. The obtained data show that the dielectric constant ε’ and dielectric loss ε” of all the studied samples decrease when increasing the frequency of applied electrical field from 200 Hz to 1 MHz. Moreover, it was found, for all the studied samples, that the ac conductivity ζac increases with increasing the frequency of the applied field. The ratio of the increase depends itself on the applied frequency. The influence of the sample’s water content on its electrical conductivity and dielectric parameters is studied in details.