Abstract
Compositional trend of the glass transition temperature and the effective activation energies of the glass transition and crystallization processes in Te20Se80-xSbx glasses (x = 1.5, 3, 4.5, 6, 7.5, 9 at.%) was investigated by differential scanning calorimetry (DSC) technique. The concept of mean coordination number, < r >, was used to describe the connectivity of the covalent networks of the present samples. The connectivity is enhanced with Antimony as indicated by an increase in T-g with x. Two linear regions in the T-g(x) relationship can be identified with a kink observed at x approximate to 4.5 corresponding to < r > approximate to 2.045. A striking similarity between the kinetic behavior of glass transition and crystallization processes was found. In both processes, a change in behavior was observed at the same crossover mean coordination number.