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http://dx.doi.org/10.4191/KCERS.2005.42.12.816

Effect of Additives on the Densification and Electrical Properties of Ce0.8Gd0.2O2-δ Ceramics  

Yoo, Kyung-Bin (Fuel Cell Research Center and Department of Materials Science and Engineering, Pohang University of Science and Technology)
Oh, Eun-Ju (Fuel Cell Research Center and Department of Materials Science and Engineering, Pohang University of Science and Technology)
Choi, Gyeong-Man (Fuel Cell Research Center and Department of Materials Science and Engineering, Pohang University of Science and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.42, no.12, 2005 , pp. 816-820 More about this Journal
Abstract
The doped-ceria is a strong candidate material for an intermediate temperature SOFC. However, the mechanical strength and the magnitude of electrical conductivity need to be increased at low sintering temperature. In this study, to improve both properties, $1at\% $ of Mg, Ca, Cr, Fe, Co, Ni, Cu, Ga, and Zr were added to the GDC20 ($20at\%$ Gd-doped Ceria) and sintered at $1350^{\circ}C$ that is $250^{\circ}C$ lower than $1600^{\circ}C$. With addition, the relative density of the sintered sample increased. Fe, Co, Ni, Cu, Ga doped-GDC20 showed high relative density over $92\%$. Among them, Ga doped-GDC20 showed the most improved sinterability. The conductivity of doped­GDC20 increased by $\~10$ times at $300\~700^{\circ}C$.
Keywords
SOFC; Electrolyte; GDC; Impedance; Sintering;
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