Sintering of Ce0.8Sm0.2O1.9
来源期刊：JOURNAL OF RARE EARTHS2007年第3期
论文作者：Mao Zongqiang Gao Ruifeng
Key words：Sm doped ceria; coprecipitation; oxygen ion conductor; sintering; solid oxide fuel cell; rare earths;
Abstract: Ce0.8Sm0.2O1.9 (SDC) powder was prepared with an oxalate coprecipitation route. SDC solid solutions were sintered at various temperatures ranging from 1100～1450 ℃, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), density measurements, and electrical conductivity measurements. The optimized processing parameters for densification were to uniaxially press the sample at 200～400 Mpa and sinter it at 1350～1400 ℃ for 4 h. The density of the sintered pellets was >90% of the theoretical density;their soakage was <0.5%;and the average grain size was 1～2 μm. The conductivities of the typical sintered specimen were 0.0133 and 0.0211 S·cm-1 at 550 and 600 ℃, respectively;Its activation energy for ionic conductivity was 0.62 eV. The dense SDC bulk material could be used as the electrolyte layer of low temperature solid oxide fuel cells.
Mao Zongqiang1，Gao Ruifeng1
(1.Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China)
Abstract:Ce0.8Sm0.2O1.9 (SDC) powder was prepared with an oxalate coprecipitation route. SDC solid solutions were sintered at various temperatures ranging from 1100～1450 ℃, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), density measurements, and electrical conductivity measurements. The optimized processing parameters for densification were to uniaxially press the sample at 200～400 Mpa and sinter it at 1350～1400 ℃ for 4 h. The density of the sintered pellets was >90% of the theoretical density;their soakage was <0.5%;and the average grain size was 1～2 μm. The conductivities of the typical sintered specimen were 0.0133 and 0.0211 S·cm-1 at 550 and 600 ℃, respectively;Its activation energy for ionic conductivity was 0.62 eV. The dense SDC bulk material could be used as the electrolyte layer of low temperature solid oxide fuel cells.
Key words:Sm doped ceria; coprecipitation; oxygen ion conductor; sintering; solid oxide fuel cell; rare earths;
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