Glass transition features of chalcogenides are important for the broad and increasing industrial
applications of these glassy semiconductors. Hence, differential scanning calorimetry was applied at
different scanning rates onAs30Te64Ga6preparedby conventional melt quenching technique in order
to study their glass transition and fragility. TheKauzmann temperature was estimated to about 136K
while its glass transition is about 397Kat 10Kmin−1.Different experimental evaluation methods
gave the same fragility index m=25orD=71which is typical of a strong liquid corresponding to the
prepared glass. Four iso-conversional methods were then applied to monitor the change in the
activation energy for the temperature range corresponding to the transition from glass to liquid. All
methods give a small monotonic decrease of the activation energy during transition from108 to
99 kJmol−1 confirming the strong character.