Frequency Dependence of AC Conductivity in Iron Phosphate Glasses

Abstract

Based on Jonscher power law, frequency dependence of ac conductivity of 40Fe2O3–60P2O5 glasses were investigated in a relatively high temperature range. Results indicated the power law exponent first decreases with increasing temperature, reached a minimum at a certain temperature and then in- creases again. Preliminary theoretical explanations and predictions for this phenomenon were presented.

AC HOPPING CONDUCTION IN LIGHTLY DOPEDInPAT LOW TEMPERATURES

“…Such phenomenon has been frequently ascribed to relaxation induced by motion of charge carriers, performing hopping between equilibrium sites. [1][2][3][4][5][6][7][8][9][10][11][12] In other systems, such as spinal magnetic ferrites, the process was assumed to be due to exchange of electrons between divalent and trivalent centers performing hopping transitions. [13][14][15][16][17][18] On the other hand, AC conduction in layered ceramics was assumed to be of a polaron hopping nature.…”