Extract

There were dramatic microstructural changes due to kinetic demixing within sintered BSCF ceramics (Ba 0.5 Sr 0.5 Co x Fe 1-x O 3—δ , x = 0.2 and 0.8: BSCF5528 and BSCF5582, respectively), when the specimens were subjected to 2 A/cm 2 at 1000 °C and pO 2  = 10 —5 atm, during which there was a significant enhancement of grain growth as well as 2nd phase formation observed in BSCF5528. 1 While there was cobalt deficient aggregates within the grains at the anode, there was cobalt rich 2nd phase particles on the grain surfaces of the microstructure at the cathode. However, there was not such phenomenon in BSCF5582, even under higher current density (7 A/cm 2 ) and longer delay time. These results were explained by the kinetic demixing/decomposition. 2

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