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The compositions Ce 0.80 Sm 0.2-x Pr x O 2-δ  (x=0-0.12) were prepared through the citrate-nitrate method. The synthesized Pr 3+  and Sm 3+  co-doped ceria powders with different compositions were calcined at 600°C for 3 h. Phase structure of the calcined powders was characterized by X-Ray diffraction (XRD) analysis.All the calcined samples were found to be ceria based solid solutions of fluorite type structures. The morphology examinations were carried out by scanning electron microscopy (SEM) analysis. Relative density of more than 91% of the theoretical can be achieved by sintering the Ce 0.80 Sm 0.2-x Pr x O 2-δ  pellets at 1400°C for 6 h. The two-probe a.c. impedance spectroscopy was used to study the ionic conductivity of the doped ceria samples. The Ce 0.80 Sm 0.80 Pr 0.12 O 1.90  composition showed the highest total ionic conductivity value which is 2.39 × 10 −2  S/cm at 600°C.

Oxide ionic conductivity and microstructures of Pr and Sm co-doped CeO 2 -based systems