Abstract
Pr 0.7Sr 0.3Fe 1− x Ni x O 3− δ (PSFN; x=0.2–0.5) compounds were synthesized and characterized by powder X-ray diffraction (XRD), thermal expansion coefficient (TEC) measurements, electrical conductivity and electrochemical impedance spectroscopy on cone-shaped electrodes on a Ce 0.9Gd 0.1O 1.95 (CGO10) electrolyte. The main phase of the powders belongs to the orthorhombic crystal system. The conductivities are fairly high, e.g., around 450 Scm −1 at 600 °C for the x=0.3 compound. The TEC of the compounds is close to the values of ceria-based electrolytes. PSFN showed hysteresis in the temperature dependence of the conductivity, TEC and area-specific polarization resistance R pol. It is considered that the hysteresis was caused by relatively slow adjustment of the oxygen stoichiometry. The electrochemical performance R pol −1 of the PSFN compounds is similar to that of La 0.6Sr 0.4Fe 0.8Co 0.2O 3− δ .
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