Electrical Conduction and Impedance Behavior of Sr0.97Ti0.6Fe0.4O3-δ Electrode Containing YSZ for Various Applications

Sr0.97Ti0.6Fe0.4O3-δ (STF) and 8 mol% Y2O3 stabilized ZrO2 (YSZ) composites were prepared by mixing them in different weight fractions. The composites were compacted into discs, sintered and evaluated for phase stability, microstructure and mixed ionic-electronic conductivity. Phase analysis by XRD showed no clearly detectable secondary phases. Chemical analysis by energy dispersive spectroscopy (EDS) also showed the diffusion of elements (especially Y and Zr from YSZ). The electrical conductivity measurement on the STF-YSZ composites showed a decrease in total electrical and ionic conductivities with YSZ amount increasing. And the ionic conduction mechanism was concerned by impedance behavior analysis.