On the Dielectric Study and AC Conductivity Measurements of Quaternary Se-Te-Ge-Pb Nano-chalcogenide Alloys

In the present study, quaternary (Se80Te20)94−xGe6Pbx (x = 0, 2, 4 and 6) glassy alloys were prepared using melt-quench technique. Investigation of dielectric properties, i.e. measurements of the real part of the dielectric constant, the imaginary part of the dielectric constant (dielectric loss) and alternating current (AC) conductivity measurements, were made in the frequency variation between 1 Hz and 1 MHz and at temperatures ranging from 300 K to 380 K. The dielectric constant, dielectric loss and AC conductivity show temperature and frequency dependence. AC conductivity was found to obey the power law (ωs where s ≤ 1). The obtained results are explained by using a correlated barrier-hopping model. The compositional dependence of the investigated parameters is discussed in detail to derive the best possible composition.