Characterization and transport properties of V2O5-Fe2O3-TeO2 glasses

IR, DSC, density and molar volume, and dc conductivity of the glasses in V2O5-Fe2O3-TeO2 system were reported. The network structure for the glass compositions with 65 and 62.5 mol%, V2O5 is built up of VO5 polyhedra, while the other glass compositions consist of VO4 polyhedra. Density and glass transition temperature were observed to decrease with an increase in V2O5 Content. The glasses had conductivities ranging from 3.31 x 10(-3) S m(-1) to 2.88 x 10(-2) S m(-1) at 400 K for V2O5 = 50-65 mol%. The electrical conductivity was confirmed to be due to adiabatic small polaron hopping. The hopping carrier mobility varied from 0.587 x 10(-5) cm(2) V-1 s(-1) to 6.904 x 10(-5) cm(2) V-1 s(-1) at 400 K. The carrier density was evaluated to be 2.997 x 10(19)-7.298 x 10(19) cm(-3). The conductivity was primarily determined by hopping carrier mobility. (c) 2005 Elsevier B.V. All rights reserved.