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Cho, Y.H.,Cho, P.S.,Auchterlonie, G.,Kim, D.K.,Lee, J.H.,Kim, D.Y.,Park, H.M.,Drennan, J. Elsevier Science 2007 Acta materialia Vol.55 No.14
This paper proposes MgO as a new scavenger material that can mitigate the harmful effects of SiO<SUB>2</SUB> impurity on the grain-boundary conduction in 10mol.% gadolinia-doped ceria (GDC). The addition of 0.3-10mol.% of MgO resulted in an up to ∼45-fold increase in the grain-boundary conduction of a GDC specimen containing 500ppm of SiO<SUB>2</SUB> impurity. The solubility limit of MgO in GDC was found to be as low as ∼0.1mol.% and most of the MgO existed as a second phase. Electron energy-loss spectroscopic analysis indicated the formation of forsterite (Mg<SUB>2</SUB>SiO<SUB>4</SUB>), due to a reaction between MgO and the siliceous intergranular phase, to be the scavenging mechanism.
Grain-Boundary Conduction in Gadolinia-Doped Ceria: The Effect of SrO Addition
Cho, Pyeong-Seok,Cho, Yoon Ho,Park, Seung-Young,Lee, Sung Bo,Kim, Doh-Yeon,Park, Hyun-Min,Auchterlonie, Graeme,Drennan, John,Lee, Jong-Heun The Electrochemical Society 2009 Journal of the Electrochemical Society Vol.156 No.3