Study of Glass Transition Temperature in Se-Te-Pb Glassy System Using Modified Gibbs-Di Marzio Law

In this study, the modified Gibbs-Di Marzio law is used to ascertain glass transition temperature (Tg) in Se-Te-Pb glassy system. Herein, the amorphous Se80–xTe20Pbx (x = 0, 1 and 2) glasses are synthesized with melt-quenching process. The structural characterizations; surface morphology and amorphous nature of these samples were deduced using X-ray diffraction and scanning electron microscopy (SEM). Phase separation in SEM micrographs clearly reveal inhomogeneity and amorphous nature of primed chalcogenide alloys. Experimentally observed Tg via differential scanning calorimetry has been compared with theoretically calculated Tg using Gibbs–Di Marzio relation. Thus determined Tg are also compared with the other empirical approaches to analyse the utility of these approaches.