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http://dx.doi.org/10.4191/kcers.2012.49.1.118

Preparation and Sintering Characteristics of Ce0.8Gd0.2O1.9 Powder by Ammonium Carbonate Co-precipitation  

Yoo, Young-Chang (School of Materials Science and Engineering, Hongik University)
Chung, Byung-Joo (Department of Chemical Engineering, Hongik University)
Sim, Soo-Man (School of Materials Science and Engineering, Hongik University)
Publication Information
Journal of the Korean Ceramic Society / v.49, no.1, 2012 , pp. 118-123 More about this Journal
Abstract
GDC20($Ce_{0.8}Gd_{0.2}O_{1.9}$) powder was synthesized from Ce and Gd nitrate solutions using ammonium carbonate($(NH_4)_2CO_3$) as a precipitant. Attrition-milling of the powder, which had been calcined at $700^{\circ}C$ for 4 h, decreased an average particle size of 2.2 ${\mu}m$ to 0.5 ${\mu}m$. The milled powder consisted of nano-sized spherical primary particles. Due to the excellent sinterability of the powder, sintering of the powder compacts for 4 h showed relative densities of 80% at 1000 $^{\circ}C$ and 96.5% at $1200^{\circ}C$, respectively. Densification was found to almost complete at $1300^{\circ}C$, resulting in a dense and homogeneous microstructure with a relative density of 99.5%. The grains of ~0.2 ${\mu}m$ in size at $1200^{\circ}C$ grew to ~1 ${\mu}m$ in size at $1300^{\circ}C$ as a result of a rapid grain growth.
Keywords
SOFC; GDC; Co-Precipitation; Ammonium carbonate; Sintering;
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Times Cited By KSCI : 1  (Citation Analysis)
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