Determination of glass-forming ability of Ge_(1-x)Sn_xSe_(2.5) (0< =x< =0.5) alloys using differential scanning calorimetry

摘要

The glass-forming ability of Ge_(1-x)Sn_xSe_(2.5) (0< =x< =0.5) alloys was studied using differential scanning calorimetry. Samples were scanned at different heating rates under non-isothermal conditions. Various simple quantitative methods were employed to assess the stability of the glassy materials in the above-mentioned system. All of these methods are based on characteristic temperatures, such as the glass-transition temperature, T_g, the onset-of-crystallization temperature, T_c, and the peak crystallization temperature, T_p. A crystallization rate factor, K, has also been used as a measure of the thermal stability of the glasses. It was found that Ge_(0.7)Sn_(0.3)Se_(2.5) was the least stable among all the samples.