Microstructure and electrical properties of nano-sized Ce_<1-x>Gd_xO_2 (0≤x≤0.2) particles prepared by spray pyrolysis

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Nano-sized Ce_<1-x>Gd_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-x>Gd_xO_2(x=0,0.05,0.1,0.2) particles were each 46,33,29, and 28nm. The mean crystallite size of pure CeO_2 was 33nm. However, the Gd-doped CeO_2 had the mean crystallite size of 28nm 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_<0.9>Gd_<0.1> O_2 and Ce_<0.8>Gd_<0.2>O_2 pellets are about 0.5-0.4μm. The pure CeO_2 pellet had low relative density of 80%. However, Ce_<0.9>Gd_<0.1>O_2 and Ce_<0.8>Gd_<0.2>O_2 pellets had the high relative densities above 95%. The Ce_<0.9>Gd_<0.1>O_2 and Ce_<0.8>Gd_<0.2>O_2 pellets had similar conductivities at all measuring temperatures. The Ce_<0.9>Gd_<0.1>O_2 pellet had conductivities of 4.73×10^<-2> and 1.16×10^<-1> Scm^<-1> at measuring temperatures of 800 and 900℃ respectively.
社団法人日本セラミックス協会の論文
2008-09-01