Abstract
In this study the oxygen deficient perovskite Ba0.75K0.25(Ca0.5Nb0.5)O2.75(BKCN 25) is synthesized by solid state method via ball milling. Improvement in total conductivity through reducing grain boundary blocking effect is attempted by performing densification using conventional, microwave and spark plasma sintering. Physical characterizations of the pellets reveal structural stability and variation in morphology and porosity among the pellets sintered using different techniques. XRD analysis confirm cubic double perovskite structure in all sintered pellets but each having different grain sizes. SEM images show densified pellets with well-defined grains separated with grain boundary. AC impedance studies reveal that oxide ionic conductivity of BKCN 25 is ∼1.08 × 10−3 S.cm−1 at 700 °C in air atmosphere similar to reported GDC15, BaCe0.5Zr0.3Y0.2O3-δand BaCe0.45Zr0.45Sc0.1O3-δSOFC electrolytes. Significant enhancement in the total conductivity can be observed for spark plasma sintered BKCN 25 sample with lowest grain boundary blocking contribution.
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