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Dispersed samples of LaMnO 3 prepared via the Pechini route and annealed at 500°C were doped with cations of a different charge and size (Ce, Fe, Bi, Sr+Bi). The effects of doping on the structural features (XRD, IR) and reducibility (H 2 TPR) of these samples were considered.

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La 0.8 Sr 0.2 Fe 0.6 Ni 0.4 O 3-x -Ce 0.9 Gd 0.1 O 2-x and La 0.8 Sr 0.2 Fe 0.8 Co 0.2 O 3-x -Ce 0.9 Gd 0.1 O 2-x nanocomposites were synthesized via ultrasonic dispersion of nanocrystalline powders of perovskite and fluorite oxides in acetone with addition of a surfactant, followed by drying and sintering at temperatures up to 1200 o C. The evolution of the structure of samples with sintering temperature was studied by XRD and TEM with EDX and compared with the data on conductivity, oxygen isotope exchange, O 2 TPD, H 2 and CH 4 TPR. Preliminary testing of buttonsize cells with cathodes supported on thin YSZ layer covering Ni/YSZ cermet demonstrated a high and stable performance of LSNF -GDC composite promising for the practical application.