Glass-forming ability and thermal stability of Se100-x(Ge2Sb2Te5)(x) glassy alloys

摘要

Glassy Se100-x(Ge2Sb2Te5)(x) (x=5, 10, 15 and 20) bulk alloys were prepared by melt-quenched technique and studied by using differential scanning calorimetry at different heating rates under non-isothermal condition. The detailed thermal analysis shows that the glass transition temperature (T-g) depends on heating rates and x content. In particular, it is found that the glass-forming ability, thermal stability (T-c-T-g) and crystallization activation energy (E-c) increase with increased x content in amorphous Se, whereas glass transition activation energy (E-g) and fragility index (F) decrease with increased x contents. Variation in these parameters can be explained on the basis of network-forming ability of Se and bonding arrangement among the constituent atoms of alloys.