GLASS-TRANSITION BEHAVIOR IN SE-RICH GE-SE ALLOYS

Differential scanning calorimetry (DSC) was utilized to study the beha vior of six Ge-Se glasses containing 0, 5, 10, 15, 17.5 and 20 at.% Ge during the glass transition. These alloys readily form glasses and ca n be prepared by quenching in air. Moreover, their behavior depends gr eatly on the composition. This work reveals that two additional proper ties must be considered: the variation in the glass transition tempera ture and different structural relaxation. The quantity used to quantif y the relaxation was the enthalpy relaxation as this measures the heat lost by the glass during annealing. Given the complexity of the relax ation process, the experimental results were analysed by means of the empirical Kohlrausch-Williams-Watts relaxation model.