Centre de Thermodynamique et de Microcalorimétrie du CNRS, 26, rue du 141ème R.I.A., 13003, Marseille, France
Abstract:
Differential scanning calorimetric measurements have been performed on amorphous Ge16Te84 alloys; the study of the dependence of the cooling rate on the reciprocal fictive temperature yields the activation energy of the relaxation process; this value fits well that deduced from shear viscosity measurements. The enthalpy difference between the supercooled liquid and the crystal has been investigated by drop calorimetry on samples annealed at different temperatures below Tg, during different times. These results, combined with the former obtained by DSC lead to the enthalpy values of the metastable liquid system from 390 to 510 K.