Abstract
In this study, Mn 2O 3 and Co 3O 4 were found to be alternative additives of Ga 2O 3 reported previously, to promote grain growth of SDC (samaria-doped ceria) effectively. Sintering at 1500 °C with additives gave sufficient density and grain growth, while those of SDC sintered without additives were low at the same temperature. The enhancement of grain boundary mobility was observed by adding Mn 2O 3, and Co 3O 4 to SDC. It was found that Mn 2O 3 and Co 3O 4 promoted grain growth of SDC even at initial stage of sintering, while Ga 2O 3 promoted rearrangement of particles first. The electrochemical property of SDC with Co 3O 4 sintered at 1400 °C was comparable to SDC without additives sintered at 1600 °C.
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