BaO effect on the thermal properties of the phosphate glasses inside the Na2O –SrO–TiO2–B2O3–P2O5 system

Abstract The glasses in the Na 2 O–SrO–BaO–TiO 2 –B 2 O 3 –P 2 O 5 system were prepared by the conventional quenching route. In the present work, we studied the effect of Ba Sr substitution on some physical parameters such as density, molar volume, micro-hardness, glass transition temperature (T g ), and crystallization temperature (T c ) of series of glasses with the following composition 33.33Na 2 O–(10 − x )SrO − xBaO–10TiO 2 –30B 2 O 3 –16.67P 2 O 5 . The crystallization of the glasses by heat-treatments is performed and X-ray diffraction (XRD) showed the formation of a ferroelectric phase SrTiO 3 and Na 4 Ba 2 (PO 3 ) 6 in their network. The kinetic of the crystallization is carried out by using DSC technique, and the activation energy and the Avrami parameter ( n ) are determined.