Levels of thermal stability in some glassy alloys of the Ge-Sb-Se system by differential scanning calorimetry

摘要

The thermal stability and crystallization of alloys in the Ge-Sb-Se system were studied by differential scanning calorimetry (DSC). A comparison of various simple quantitative methods to assess the level of stability of the glassy materials in the above-mentioned system is presented. All of these methods are based on characteristic temperatures, obtained by heating of the samples in non-isothermal regime, such as the glass transition temperature, T_g, the temperature at which crystallization begins, Tm, the temperature corresponding to the maximum crystallization rate, T_p, or the melting temperature, rm. In this work, a parameter Kr(T) is added to the stability criteria. The thermal stability of some ternary compounds of Ge_xSb_(0.23-y)Se_(0.77-x+y) type has been evaluated experimentally and correlated with the activation energies of crystallization by this kinetic criterion and compared with those evaluated by other criteria.