Abstract
Differential scanning calorimetry (DSC) and XRD were used to investigate the role of sulfur in the network of V
2
O
5
-Fe
2
O
3
-BaO glasses. The crystallization kinetics of the glasses were investigated under non-isothermal conditions applying the formal theory of transformations for heterogeneous nucleation to the experimental data obtained by DSC. The activation energy for the glass transition (E
g
) was derived from dependence of the glass-transition temperature (T
g
) on the heating rate. Similarly the activation energy of the crystallization (E
c
) and the frequency factor (K
0
) were determined. The results reveal the increase of the activation energy for glass transition was attributed to the increase in the rigidity and the cross-link density of these composites. The evaluated thermal stability decreases with increasing sulfur content. The phases of BaFe
2
O
4
, V
2
O
5
and FeVO
4
micro-crystallites in the remaining amorphous matrix have been identified by X-ray diffraction.