Frequency dependent conductivity of some vanadate glassy system

Abstract The investigation of wide range of temperature and frequency dependent conductivity of some semiconducting glassy nanocomposites, xV2O5-(1 − x) (0.05SeO2-0.95ZnO) with x = 0.35, 0.55, 0.75, and 0.95 reveals DC conductivity, crossover frequency, and frequency exponent. The composition dependence of AC conduction activation energy and the permissible energy of polaron migration also have been computed. The thermally activated DC conductivity illuminates nonlinearity. The Vogel-Tamman-Fulcher model is the appropriate model to analyze the DC conductivity results. Employing the Jonscher's universal power law, the values of power law exponent have been anticipated from the dispersion region of the AC conductivity spectra. The temperature-dependent power law exponent indicates that the correlated barrier-hopping model is the effective mechanism for AC conduction of all the glass compositions. The Nernst-Einstein relation proves that the concentration of charge carriers does not undertake a substantial part in electrical conduction whereas it specifies that the mobility of the charge carrier accomplishes an important role in the conduction process. Scaling of conductivity spectra discloses that the conductivity relaxation process is temperature independent but composition dependent.