TEMPERATURE AND FREQUENCY-DEPENDENCE OF DIELECTRIC-CONSTANT AND CONDUCTIVITY OF NATURAL EGYPTIAN MONAZITE

Dielectric results at frequencies between 0.1 and 100 kHz throughout t emperature range of 150-450 K are given for the natural Egyptian monaz ite. Three distincit absorption peaks (gamma, beta, and alpha) are obs erved in order of increasing temperature. Displacement toward high tem peratures of the three relaxations with increasing frequencies is just ified. The Cole-Cole diagrams have been used to determine the molecula r relaxation time tau and the activation energy of the beta-relaxation . The A.C. conductivity is found to be proportional to omega(S(T)). Th e high value of A.C. conductivity compared with the D.C. conductivity indicates the dominance of the dipole polarization mechanism.