PHYSICAL AGING IN VITREOUS GE-TE-SB CALORIMETRIC AND X-RAY-ABSORPTIONSTUDIES

In this paper, aging phenomena observed on vitreous Ge-15-Te82Sb3 allo ys are investigated by differential scanning calorimetry (DSC) and ext ended X-ray absorption fine structure (EXAFS) spectroscopy. The DSC tr aces obtained on aged samples show a single glass transition temperatu re and a single crystallization phenomenon, while for a fresh sample t wo glass transition temperatures and two crystallization phenomena app ear. EXAFS analysis registered at the Ge K edge, on fresh and aged sam ples, at room and low temperatures, show that aging does not modify th e local order around the Ge atoms.