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The perovskite Cr-doped La0.6Sr0.4CrxFe1-xO3-δ(x=0.10,0.20) oxides were synthesized via the citrate gel method.The perovskite forming of the La0.6Sr0.4CrxFe1-xO3-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 H 2-containing helium atmospheres of La0.6Sr0.4CrxFe1-xO3-δ(x=0.10,0.20) were investigated by TG and XRD.The sintering microstructures of the perovskite La0.6Sr0.4CrxFe1-xO3-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 La0.6Sr0.4CrxFe1-xO3-δ(x=0.10,0.20) oxides was significantly improved compared to the Co-containing La0.6Sr0.4Co0.2Fe0.8O3-δ and Ba0.5Sr0.5Co0.8Fe0.2O3-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 La0.6Sr0.4CrxFe1-xO3-δ(x=0.10,0.20) oxides.
The perovskite Cr-doped La0.6Sr0.4CrxFe1-xO3-δ (x = 0.10, 0.20) oxides were synthesized via the citrate gel method. The perovskite forming of the La0.6Sr0.4CrxFe1-xO3- 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 H 2-containing helium atmospheres of La0.6Sr0.4CrxFe1-xO3-δ = 0.10, 0.20) were investigated by TG and XRD.The results of microstructures of the perovskite La0.6Sr0.4CrxFe1-xO3- 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 La0.6Sr0.4CrxFe1-xO3-δ (x = 0.10, 0.20) oxides was significantly improved compared to the Co-containing La0 .6Sr0.4Co0.2Fe0.8O3-δ and Ba0.5Sr0.5Co0.8Fe0.2O3-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 La0.6Sr0.4CrxFe1-xO3-δ (x = 0.10, 0.20) oxides.