Effect of mixed sodium and vanadium on the electric and dielectric properties of zinc phosphate glass

Abstract

Melt quenching technique is employed to prepare a mixture of sodium and vanadium phosphate glasses. The amorphous nature of the samples is confirmed using X-ray diffraction. Conductivity and electric properties are investigated using complex impedance spectroscopy in a frequency range from 40 Hz to 107 Hz and a temperature range from 493 K to 603 K. The change in the conductivity and activation energy depends upon the chemical composition and indicates a changeover of the predominant conduction mechanism from ionic to polaronic. The dc conductivity showed a minimum for the sample NPZV20, with the addition of V2O5 due to the structural changes while the AC conductivity is found to obey Josher's universal power law, σac(ω) = Aωs, (ω is the angular frequency). The exponent (s) is determined, and the data suggest that s increased with temperature. The electrical modulus exhibited relaxation character.