Abstract
Single phase Sr1-xSmxFeO3-δ solid solutions were synthesized at 1100 °C in air within the two ranges 0.05 ≤ х ≤ 0.50 (with the cubic structure, sp. gr. Pm3m) and 0.85 ≤ x ≤ 1.0 (with the orthorhombic structure, sp. gr. Pbnm). The structural parameters were refined by the Rietveld analysis. The influence of samarium content in Sr1-xSmxFeO3-δ on the oxygen nonstoichiometry, thermal expansion and electrical conductivity has been studied. Gradual substitution of strontium by samarium ions leads to the increase in oxygen content. Electrical conductivity and thermal expansion of solid solutions decrease on doping. The maximum conductivity value equal to 240 S/cm was obtained for Sr0.9Sm0.1FeO3-δ at 300 °C in air. The positive value of Seebeck coefficient indicates predominant p-type conductivity in Sr1-xSmxFeO3-δ. Chemical reactivity of Sr1-xSmxFeO3-δ in contact with the solid electrolyte materials Ce0.8Sm0.2O2 and Zr0.85Y0.15O2 was examined within the temperature range of 800–1100 °C in air.
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