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http://dx.doi.org/10.4191/KCERS.2010.47.2.183

Preparation of Ce0.8Gd0.2O1.9 Powder by Milling of CeO2 Slurry and Oxalate Precipitation  

Sim, Soo-Man (School of Materials Science and Engineering, Hongik University)
Publication Information
Journal of the Korean Ceramic Society / v.47, no.2, 2010 , pp. 183-188 More about this Journal
Abstract
$Ce_{0.8}Gd_{0.2}O_{1.9}$(GDC20) powder was synthesized by milling of $CeO_2$ slurry and Gd oxalate precipitation. The mixture of $CeO_2$ powder and Gd precipitates calcined at $600^{\circ}C$ for 2 h showed the particle size distribution similar to that of $CeO_2$ powder, which had been milled during the synthesis process. Attrition milling of the calcined powder with an average particle size of $0.36\;{\mu}m$ for 2 h resulted in a decrease in the particle size to $0.24\;{\mu}m$. Although the milled powder consisted of small particles(<$1\;{\mu}m$), a small amount of fine platy $Gd_2O_3$ particles, which had been survived in the milling process, was observed. Sintering of the powder compacts for 4 h showed relative densities of 80.7% at $1300^{\circ}C$ and 97% at $1400^{\circ}C$, respectively. Densification was found to almost complete at $1500^{\circ}C$, resulting in a dense and homogeneous microstructure with a relative density of 99.5%.
Keywords
SOFC; GDC; Oxalate precipitation; Milling; Sinterability;
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