Synthesis, characterization, and ionic transport study of Bi-Fe doped BaCoO3-δ electrolytes

Nanostructured BaBi0.2Co0.35Fe0.45O3-δ (BBCF) was prepared using the citrate auto-ignition method and sintered at different temperatures. Reitveld refinement of the XRD profiles indicated that the particle size and the microstrain show the opposite nature with the increase in sintering temperature. The FT-IR study confirmed different chemical bonds between the elements. The ionic conductivity of the samples decreased with theincrease in sintering temperature. The change in different structural, optical, and electrical properties due to variation in sintering temperature has been discussed and correlated.