Abstract
The perovskite La 0.6Sr 0.4M 0.3Fe 0.7O 3− δ (M = Co, Ti) powders have been synthesized by the citrate gel method. The structural and chemical stability of the La 0.6Sr 0.4M 0.3Fe 0.7O 3− δ (M = Co, Ti) oxides were studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) techniques. The electrical conductivities of the sintered La 0.6Sr 0.4M 0.3Fe 0.7O 3− δ (M = Co, Ti) ceramics were measured. The results demonstrate the chemical stability in H 2/helium (He) atmosphere of the La 0.6Sr 0.4Ti 0.3Fe 0.7O 3− δ oxide is improved significantly compared to that of the La 0.6Sr 0.4Co 0.3Fe 0.7O 3− δ oxide. The incorporation of Ti 3+/4+ ions in the perovskite structure can significantly stabilize the neighboring oxygen octahedral due to the stronger bonding strength, leading to the enhanced structural and chemical stability of the La 0.6Sr 0.4Ti 0.3Fe 0.7O 3− δ . In addition, the perovskite La 0.6Sr 0.4M 0.3Fe 0.7O 3− δ (M = Co, Ti) oxides possess much higher chemical stability in CO 2/He atmosphere than that of Ba 0.5Sr 0.5Co 0.8Fe 0.2O 3− δ oxide, in which the perovskite structure is destroyed completely in a flowing CO 2-containing atmosphere.
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