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The efficiency of glass ceramic sealants plays a crucial role in hightemperature applications performance and durability, such as oxygen separationfrom air. In order to develop suitable sealants, operating at about 950C,several glass-ceramics with different compositional additives and ratios in BASsystem have been prepared and investigated. The effects of additive oxides,CaO, CoO, B2O3, as network modifiers on the thermal and dielectric propertiesof BAS glass-ceramic for further oxygen transport membrane OTM applicationswere evaluated and discussed. The addition of additives has evident effects onthe main crystalline phases and physical properties of the glass-ceramics.Among these systems, B2O3-rich BAS system, BABS, can be densified at thesintering temperature below 700C through viscous sintering. Also, BABS showsthe lowest dilatometric softening temperature at 675C, which can be explainedby a fast densification associated with a shrinkage of 25 percents. It hashighest conductivity, a high dielectric constant of 67.8 and a loss of 0.029 at10MHz, which provide an attractive feature for many technological applications.The electrical results obtained for BABS glass-ceramic are consistent with thetypical requirements for an excellent sealant. However, considering all otherproperties investigated, only B2O3-rich BAS meets the requirements for use as asealant for BSCF membrane. Low softening temperature of BABS opens more waysfor adding additives to tailor its functional properties, which enable forusing as sealant material for OTM applications.

Influence of additives (CoO, CaO, B2O3) on thermal and dielectric properties of BaO-Al2O3-SiO2 glass-ceramic sealant for OTM applications