OPEN CHEMISTRY, cilt.16, sa.1, ss.827-832, 2018 (SCI-Expanded)
The compositions Ce0.80Sm0.2-xPrxO2-δ (x=0-0.12)
were prepared through the citrate-nitrate method. The
synthesized Pr3+ and Sm3+ 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 Ce0.80Sm0.2-xPrxO2-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 Ce0.80Sm0.08Pr0.12O1.90 composition showed the
highest total ionic conductivity value which is 2.39 × 10−2 S/cm at 600°C.