KJ Ceramics 31

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Detailed Program

Paper Number : FU-P03

Time Frame : 12:00~13:30

Presentation Date : Thursday, 27, November

Session Name : Fuel cells and Batteries

Session Chair 1# : -

Session Chair 2# : -

Sintering Behavior and Electrical Properties of Gd-doped Ceria with the Addition of Li Salt

Dr. Junga Lee

Kyungpook National University

Gd-doped CeO2(GDC) has high ionic conductivities in the electrolytes at SOFC intermediate temperatures of 500~700oC. However, GDC required the high sintering temperature above 1300oC to get the high sintering density of 95%. So many researches were studied the use of dopants and nano-sized powder processing to lower sintering temperature. Transition metal such as Co, Mn, Cu, Ni, Fe and others such as Li, K, Ca, Zn, Al, Bi et al., introduced to GDC as sintering additives. It was reported that Co, Cu, Mn, Fe and Li reduce the sintering temperature, while Ca and Mg has little effect, and Al and K increase the sintering temperature. In particular, Co and Li lowered the sintering temperature by formation of liquid phase. Also, lithium salt, such as LiNO3, Li2CO3 and LiF improved the densification and lowered the sintering temperature in the SDC, BaZr0.8Y0.2O3-, YSZ, BaTiO3 and complex perovskite materials such as BZT, BMT and BZN. In this study, we investigated the effect of different kinds of Li salt on sintering behavior and electrical property in the GDC. GDC(Gd0.1Ce0.9O1.95), Li2CO3 and LiNO3 were used as starting materials The samples were sintered with 5oC/min heating rate at from 800oC to 1400oC for 2hrs. The density was determined using the Archimedes method and the dilatometer was used for monitoring the shrinkage. Phase identification was used by x-ray diffraction analysis and the microstructures were determined using a FE-SEM.

Acknowledgements :

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