J. Korean Ceram. Soc. > Volume 52(6); 2015 > Article
 Journal of the Korean Ceramic Society 2015;52(6): 521. doi: https://doi.org/10.4191/kcers.2015.52.6.521
 Preparation of Ce0.8Gd0.2O1.9 Powder Using CeO2 Powder and Gd Precipitation and Effect of CoO doping on Sintering Soo-Man Sim School of Materials Science and Engineering, Hongik University ABSTRACT $Ce_{0.8}Gd_{0.2}O_{1.9}$(GDC20) powder was prepared from a mixture of submicron-sized $CeO_2$ powder and Gd precipitates using ammonium carbonate $((NH_4)_2CO_3)$ as a precipitant. The mixture was calcined at $700^{circ}C$ for 4 h followed by ball-milling that resulted in the GDC powder with an average particle size of $0.46{mu}m$. The powder had a very uniform particle size distribution with particle sizes ranging from $0.3{mu}m$ to $1{mu}m$. Sintering of undoped GDC samples did not show a relative density of 99.2% until the temperature was increased to $1500^{circ}C$, whereas GDC samples doped with 5 mol% CoO exhibited a significant densification at lower temperature reaching a relative density of 97.6% at $1100^{circ}C$ and of 98.8% at $1200^{circ}C$. Key words: SOFC electrolyte, GDC, $CeO_2$ powder, CoO doping, Sintering
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