Nano-sized Ce
1-xGd
xO
2 (0 ≤
x ≤ 0.2) particles were prepared by spray pyrolysis process from the spray solution with ethylene glycol. The mean sizes of Ce
1-xGd
xO
2 (
x = 0, 0.05, 0.1, 0.2) particles were each 46, 33, 29, and 28 nm. The mean crystallite size of pure CeO
2 was 33 nm. However, the Gd-doped CeO
2 had the mean crystallite size of 28 nm irrespective of the molar ratio of Gd to Ce components. The mean grain size of the sintered CeO
2 pellet was about two or four times larger than those of the Gd-doped CeO
2 pellets. The mean grain sizes of Ce
0.9Gd
0.1O
2 and Ce
0.8Gd
0.2O
2 pellets are about 0.5-0.4 μm. The pure CeO
2 pellet had low relative density of 80%. However, Ce
0.9Gd
0.1O
2 and Ce
0.8Gd
0.2O
2 pellets had the high relative densities above 95%. The Ce
0.9Gd
0.1O
2 and Ce
0.8Gd
0.2O
2 pellets had similar conductivities at all measuring temperatures. The Ce
0.9Gd
0.1O
2 pellet had conductivities of 4.73 × 10
-2 and 1.16 × 10
-1 Scm
-1 at measuring temperatures of 800 and 900°C respectively.
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