Synthesis and characterization of Ba0.5Sr0.5Co0.8Fe0.2O3−σ

Abstract

Perovskite-type Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ (BSCFO) powders were synthesized using two methods, solid-state reaction (SSR) method and citrate-EDTA complexing method (CC-EDTA). Then the powders were pressed to green disks of 19 mm in diameter and sintered at 1140°C for 5 h. The shrinkage rate and relative density of the membranes prepared from the perovskite-type powders were determined and calculated, and the powders and derived membranes were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the shrinkage rates of the two kinds of disks are nearly the same (about 10%). The disks prepared by the SSR method had a bigger grain size and lower relative density than those prepared by the CC-EDTA method. The conductivity of the membranes prepared by the SSR method was about 38 S/cm, higher than that of the membranes prepared by the CC-EDTA method, which was about 30 S/cm, at the same temperature of 600°C.

Properties of Ba0.5Sr0.5Co0.8Fe0.2O3-δ Composite Membrane

“…Generally, the sintering activity of the powder synthesized by CE-EDTA method is higher than that of the powder prepared by the SSR method (17,18). Therefore, the powder synthesized by SSR method will be used for the porous support layer while the powder synthesized by CE-EDTA method will be used for the dense layer.…”