The non-bridging oxygen due to modification of glass network by Ba2+ might be bonded by Y3+ cations which lead to the higher Tg of this particular glass as compared to the BaLa and BaAl glasses. Interestingly, the cation field strength might not be playing very important role to govern the glass transition temperature since the field strength of Al3+ has high value as compared to the Y3+and La3+cations. Thermal data obtained from DTA measurement of these glasses was used to calculate the thermal stability and activation energy for crystallization.