In this paper, the relationship between the phase purity, microstructure, conductivity and thermal expansion of the M (Al, Fe, Y and Bi) doped SDC (Ce0.8Sm0.2O1.9) electrolytes was investigated. Ce0.75Sm0.2M0.05O1.875 (M = Al, Fe, Y, Bi) electrolytes were prepared by sol–gel auto-combustion process. From XRD analysis, the dopant ions (Al, Fe, Y and Bi) are doped in the lattice of cubic fluorite structure of SDC and no second phase is formed for Ce0.75Sm0.2M0.05O1.875 (M = Al, Fe, Y, Bi) calcined at 700 °C for 4 h. However, the impurity phase of Ce2O3 is formed for Ce0.75Sm0.2Al0.05O1.875 sintered at 1400 °C for 4 h. Moreover, the relative densities of the samples increase after doped with Fe, Y and Bi. While Al doping cannot improve the sintering performance and decreases the density. These results are consistent with the SEM images. In addition, the grain size of Ce0.75Sm0.2Bi0.05O1.875 is the largest as indicated by SEM microstructure. More importantly, the average thermal expansion coefficient and ionic conductivity of the sintered samples improves after doped with Fe, Y and Bi, which suggests that Ce0.75Sm0.2M0.05O1.875 (M = Al, Fe, Y, Bi) can be a potential electrolyte for the IT-SOFC.
Journal of Materials Science: Materials in Electronics – Springer Journals
Published: May 28, 2018
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