Dielectric studies and Cole-Cole plot analysis of Na2O – (1-x)ZnO –xCoO –P2O5 glasses

Abstract

This paper presents a detailed characterization of the dielectric properties of the new zinc sodium phosphate glass, changed when it's doped with different mole ratios of cobalt (x = 0, 1, 2 and 5 mol %) one of a transition metal ions, to obtain the final glass Na2Zn1-xCoxP2O7, has been prepared and used. The electrical characterizations of the bulk glasses were performed in different frequency and temperature range by using alternating current impedance spectroscopy. The dielectric constant ε′(ω) and loss ε″(ω) are studied as a function of the temperature and frequency. Furthermore the dielectric data are fitted and analyzed according to the Cole Cole model equation, and from this model the dispersion parameters as the exponentα, the dielectric relaxation timesτj, the activation energy Eτ and an equivalent electrical circuit of the sample are evaluated.