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La0.6Sr0.4CO1-yFeyO3(y=0-1.0)powders were synthesized by a citrate method,and the structure and mixed electronic-ionic conducting properties of the resulting ceramics were investigated.The synthesized La0.6Sr0.4CO1-yFeyO3 powders have a pure perovskite structure and consist of uniform and fine particles.A perovskite structure with rhombohedral symmetry was certified for the La0.6Sr0.4CO1-yFeyO3ceramics.The increase of Co/Fe ratio significantly promoted the grain growth and microstructural densification.The La0.6Sr0.4CO1-yFeyO3 compositions with relatively higher Co/Fe ratio exhibit superior mixed conducting properties.The electronic structure and microstructure of the ceramics are responsible for the variation of the mixed conducting properties with Co/Fe ratio.