The characteristic temperatures such as the glass transition temperature (Tg), the onset temperature of crystallization (Tc) and the melting temperatures, (Tm) have been determined for glasses belonging to the GexSe100 − x − yFey (y = 2,
4 and 6 at.%). Differential scanning calorimetry and differential
thermal analysis measurements have been used for their determination.
These temperatures have been used to evaluate the thermal stability of
the investigated glassy alloys using Dietzel (ΔT) and Hruby (Hr) criteria. The variations of ΔT and Hr with the average coordination number, n, have been specified. It is found that both ΔT and Hr exhibit a maximum at n = 2.4.
This observation is a realization of Phillips'–Thorpe threshold where
the maximum stability of the network is just obtained if the percolation
threshold limit is reached. The overall mean bond energies of the
studied compositions have also been calculated and their correlation
with the glass transition temperature is discussed.
Journal
Title
Materials Letters, Volume:61, Issue:2, January 2007, Pages:432-436