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The perovskite Cr-doped La_0.6Sr_0.4Cr_xFe_1-xO_3-δ (x=0.10, 0.20) oxides were synthesized via the citrate gel method. The perovskite forming of the La_0.6Sr_0.4Cr_xFe_1-xO_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_0.6Sr_0.4Cr_xFe_1-xO_3-δ (x=0.10, 0.20) were investigated by TG and XRD. The sintering microstructures of the perovskite La_0.6Sr_0.4Cr_xFe_1-xO_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_0.6Sr_0.4Cr_xFe_1-xO_3-δ (x=0.10, 0.20) oxides was significantly improved compared to the Co-containing La_0.6Sr_0.4Cr_xFe_1-xO_3-δ and Ba_0.5Sr_0.5Co_0.8Fe_0.2O_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_0.6Sr_0.4Cr_xFe_1-xO_3-δ(x=0.10, 0.20) oxides.