Dielectric Properties of Natural Syrian and Armenian Zeolites

Using an experimental arrangement, designed and manufactured locally, the electric permittivity ${\varepsilon=\varepsilon'-i\varepsilon''}$ and alternative current (a.c.) conductivity $\sigma_{ac}$ of natural Syrian and Armenian zeolites were investigated in order to understand the mechanism of the electrical properties in these materials. The frequency dependence of angle tangents ($\tan\delta=\varepsilon''/\varepsilon'$) of dielectric losses was also studied for both zeolites. The mentioned measuring arrangement has a configuration of an electrical bridge. The data has showed that the dielectric constant $\varepsilon'$ and dielectric loss $\varepsilon''$ for all studied samples decrease when increasing the frequency of the applied electrical field from 200 Hz to 1 MHz. Moreover, it was found out for all studied samples that the \emph{ac} conductivity $\sigma_{ac}$ increases with the frequency of the applied electrical field. The ratio of such increasing depends itself on the applied frequency.