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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 197-198Sintering and Electrical Properties of...

Sintering and Electrical Properties of Ce_0.8Sm_0.2O_1.9 Solid Electrolyte Modified by Addition of MnO₂

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Abstract:

The effect of MnO₂ addition (0–2.0 mol%) on the densification, crystal structure, and ionic conductivity of Ce_0.8Sm_0.2O_1.9 (SDC) was studied. The addition of MnO₂ promotes densification, reducing sintering temperature by ~150°C. X-ray diffraction analysis showed that all the samples exhibit a fluorite structure. Impedance spectroscopy measurements indicated that SDC with appropriate ratio of MnO₂ addition has higher ionic conductivity and lower activation energy compared with that of SDC. As the addition amount of Mn increases up to 1.0 mol% [(Ce_0.8Sm_0.2O_1.9)_0.99+(MnO₂)_0.01], the sample attains the highest ionic conductivity, about 35% higher than that of SDC at 600°C. In addition, Mn addition has little effect on bulk conductivity, but a marked influence on grain boundary behavior is observed.

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Periodical:

Advanced Materials Research (Volumes 197-198)

Pages:

610-616

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.197-198.610

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Online since:

February 2011

Authors:

Yi Feng Zheng, Lu Cun Guo

Keywords:

Crystal Structure, Electrical Properties, Fuel Cell (FC), Ionic Conductivity, Sintering

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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