SYNTHESIS AND CHARACTERIZATION OF SUPERIONIC CONDUCTING GLASSES (AgI)x(Ag2S)x(AgPO3)1-2x

Abstract

SYNTHESIS AND CHARACTERIZATION OF SUPERIONIC CONDUCTING GLASSES (AgI)_x(Ag₂S)_x(AgPO₃)_1-2x. Samples of Superionic Conducting Glasses (AgI)_x(Ag₂S)_x(AgPO₃)_1-2x with x = 0, 0.09, 0.17, 0.23, 0.33, 0.37, 0.41 and 0.44 have been synthesized by rapid quenching method. Some physical properties including crystal structure, thermal behavior, ionic conductivity and transference number have been characterized and measured by using respectively, an X-Ray Diffractometer (XRD), a Differential Scanning Calorimetric (DSC), and an Impedance Spectroscopy (LCR-meter). The diffraction patterns of (AgI)_x(Ag₂S)_x(AgPO₃)_1-2x for all compositions of x show only one broad peak indicating that all the samples are good glasses and have an amorphous structure. In general the glass transition temperature Tg, decreases from 398oC to 275 ^oC as x increases. The results of ionic conductivity (s) measured at various frequencies and voltages show a significant increase as x increases.The maximum ionic conductivities are obtained for x=0.44 at different voltages s(0.5 volt)=1.66x10^-2 S/cm, s(1 volt)=1.91x10^-2S/cm, s(2 volt)=2.34x10^-2 S/cm, while the ionic conductivities for un-doped glass AgPO₃ are s(0.5 volt)=9.33x10^-8S/cm, s(1 volt)=1.17x10^-7S/cm, s(2 volt)=1.55x10^-7 S/cm. The transference number, t_ion is approximate to 1 indicating that the conduction is essentially ionic in nature.