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Title: Modification of B-site doping of perovskite LaxSr1 - xFe1 - y-zCoyCrzO3 - δ oxide by Mg2+ ion
Authors: Gong, Z. 
Yin, X. 
Hong, L. 
Keywords: B-site doping
Chemical stability
Grain boundary
Mixed ionic-electronic conductors
Perovskite oxide
Issue Date: 12-Nov-2009
Citation: Gong, Z., Yin, X., Hong, L. (2009-11-12). Modification of B-site doping of perovskite LaxSr1 - xFe1 - y-zCoyCrzO3 - δ oxide by Mg2+ ion. Solid State Ionics 180 (28-31) : 1471-1477. ScholarBank@NUS Repository.
Abstract: Co-doping B-site of perovskite oxide LaxSr1 - xCoyFe1 - yO3 - δ (LSCFO) with Cr6+ and Mg2+ ions has been attempted in this research for revamping chemical stability and oxygen ionic conductivity of this mixed conducting oxide. It is known that partial substitution for B-site cations of LSCFO by Cr gives rise to a significant improvement on chemical and thermal stability of the perovskite oxide. On the basis of this doped structure, introduction of an immaterial dose of Mg2+ ion into its B-site results in a microstructure consisting of smaller grains with higher density than its precursor. Furthermore, the resulting perovskite oxide La0.19Sr0.8Fe0.69Co0.1Cr0.2 Mg0.01O3 - δ (LSFCCMO) displays higher O2- conductivity than the solely Cr-doped LSCFO besides the improved chemical stability against reduction in 5% CH4/He stream at 850 °C. A detailed examination of the oxidation states of B-site transition metal ions by XPS has also been conducted as a part of structural characterizations of LSFCCMO. The assessment of relative O2- conductivity shows that the grain boundary area plays a more important role than the bulk phase in facilitating ion transport, but with comparable boundary areas the higher densification level is favorable. © 2009 Elsevier B.V. All rights reserved.
Source Title: Solid State Ionics
ISSN: 01672738
DOI: 10.1016/j.ssi.2009.09.009
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