DIELECTRIC-RELAXATION AND AC CONDUCTION OF AGSBSE2 IN THE SOLID AND LIQUID-PHASES

Measurements of the dielectric properties of Ag Sb Se2 in the solid and liquid phases have been carried out in a wide range of frequencies (10 to 10(6) Hz) at different temperatures (300 to 800-degrees-C). The material displays dielectric dispersion and a loss peak has been observed. Cole-Cole diagrams have been used to determine the distribution parameter (alpha) and the molecular relaxation time (tau), and Eyrings relaxation rate equations have been used to determine the free energy of activation. The process of dielectric relaxation (loss) and ac conduction has beer attributed to the correlated barrier hopping model suggested by Elliott for amorphous solids where two carriers simultaneously hop over a barrier between charge defect D+ and D states.