Abstract
Ce 0.8 Gd 0.2 O 1.9 (GDC20) powder was synthesized by milling of CeO₂ slurry and Gd oxalate precipitation. The mixture of CeO₂ powder and Gd precipitates calcined at 600℃ for 2 h showed the particle size distribution similar to that of CeO₂ powder, which had been milled during the synthesis process. Attrition milling of the calcined powder with an average particle size of 0.36 ㎛ for 2 h resulted in a decrease in the particle size to 0.24 ㎛. Although the milled powder consisted of small particles(＜1 ㎛), a small amount of fine platy Gd₂O₃ 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℃ and 97% at 1400℃, respectively. Densification was found to almost complete at 1500℃, resulting in a dense and homogeneous microstructure with a relative density of 99.5%.
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