We report the effect of BaO addition on thermal, crystallization, electrical and mechanical
behavior of the magnesium lanthanum alumino borosilicate glass-ceramics. The glass
forming region has been found to be quite narrow with respect to BaO content. Casting and
annealing of completely transparent and amorphous glasses within this system has been
possible only at an optimum BaO content of 25 mol% without any La2O3 and Al2O3. On
further optimization of the developed glasses in terms of different borosilicate ratios, one
of the developed compositions having MgO and BaO content of 22 and 25 mol% respectively,
with a glass former ratio of 3 (SiO2:B2O3) has been found to be quite promising in
terms of its mechanical property, excellent joining, minimum chemical interaction and
lowest leak-rate with the metallic interconnect such as Crofer22APU, and thus fulfills the
major requirements for SOFC sealing application.