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 ) 2 CO 3 ) as a precipitant. Attrition-milling of the powder, which had been calcined at 700℃ for 4 h, decreased an average particle size of 2.2 μm to 0.5 μm. 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℃ and 96.5% at 1200℃, respectively. Densification was found to almost complete at 1300℃, resulting in a dense and homogeneous microstructure with a relative density of 99.5%. The grains of ~0.2 μm in size at 1200℃ grew to ~1 μm in size at 1300℃ as a result of a rapid grain growth.
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