Temperature and Frequency Dependence of Dielectric Constant and Conductivity of Natural Egyptian Monazite

Abstract

Dielectric results at frequencies between 0.1 and 100 kHz throughout temperature range of 150–450 K are given for the natural Egyptian monazite. Three distincit absorption peaks (γ, β, and α) are observed in order of increasing temperature. Displacement toward high temperatures of the three relaxations with increasing frequencies is justified. The Cole-Cole diagrams have been used to determine the molecular relaxation time τ and the activation energy of the β-relaxation. The A.C. conductivity is found to be proportional to ω S ( T ) . The high value of A.C. conductivity compared with the D.C. conductivity indicates the dominance of the dipole polarization mechanism.