The quantity Tx − Tg, which indicates the thermal stability of glasses against crystallization, and Hruby's parameter (Kgl) specifying the glass forming ability given by (Tx − Tg) / (Tm − Tx) were calculated from the obtained thermal parameters and given in Table 1. It can be observed that both Tx − Tg and Hruby's parameter (Kgl) increased with the increase in CaF2 content in the glass batch, suggesting that incorporation of more CaF2 content into the barium phosphate glass network leads to better thermal stability against crystallization and improvement in glass forming ability [7], [11] and [12]. In Fig. 1(a), it can be noted that the area of exothermic peak (Tp2), which is proportional to the heat of crystallization decreases sharply above 4 mol% of the CaF2 content. This result further confirms that the addition of CaF2 above 4 mol% into the barium phosphate glass batch results in substantial improvement in thermal stability against crystallization [13].