*2.2. Differential Thermal Analysis (DTA)*

The differential thermal analyses of the studied glasses were achieved via a Labsys DSC-TG 1600 ◦C Setaram (France). About 60 mg of the pulverized glass of grain size less than 0.60 mm and more significant than 0.2 mm was used. Al2O3 powder was the reference material. A heating rate of 10 ◦C/min and a sensitivity setting of 8 μv/cm were maintained for all the DTA runs.
