Crystallisation kinetics of GexSb40-xS60 glasses

The results of differential scanning calorimetry at different heating rates on GexSb40-xS60 glasses are reported and discussed. From the variation of heating rate (alpha), glass transition temperature (T-g), crystallisation t emperature (T-c), peak temperature of crystallisation (T-p), crystallisatio n fraction (x), enthalpy of crystallisation (Delta H-c) and effective activ ation energy for crystallisation (E-c) are evaluated and their composition dependencies discussed. It was discovered that the crystallisation of GexSb 40-xS60 glasses occurs with mixed mechanism. The results indicate that, at average coordination number (Z) similar to 2 . 65, there is a change from b ulk to surface nucleation.