Sou Hwan Son

Structural, Sintering and Electrical Properties of Cr-doped La0.6Sr0.4CrxFe1−xO3−δ (x=0.10, 0.20) Oxides

The perovskite Cr-doped La 0.6 Sr 0.4 Cr x Fe 1− x O 3− δ ( x =0.10, 0.20) oxides were synthesized via the citrate gel method. The perovskite forming of the La 0 6 Sr 0.4 Cr x Fe 1− x O 3− δ ( x =0.10, 0.20) oxides were studied by thermogravimetric analysis (TG), differential scanning calorimetry (DSC), and X-ray diffraction (XRD). Structural and chemical stability under H2-containing helium atmospheres of La 0.6 Sr 0.4 Cr x Fe x O 3− δ ( x =0.10, 0.20) were investigated by TG and XRD. The sintering microstructures of the perovskite La 0.6 Sr 0.4 Cr x Fe x O 3− δ ( x =0.10, 0.20) ceramics were investigated by scanning electron microscopy (SEM), and the electrical conductivities of both oxide ceramics were also measured up to 900 °C. The results demonstrated that the chemical stability of the Co-free La 0.6 Sr 0.4 Cr X Fe 1− X O 3− δ ( x =0.10, 0.20) oxides was significantly improved compared to the Co-containing La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3− δ and Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ oxides. The incorporation of Cr cations in the B -site of the pervoskite oxides resulted in the improved structural and chemical stability of the as-synthesized La 0 6 Sr 0.4 Cr x Fe 1− X O 3− δ ( x =0.10, 0.20) oxides.