Influence of Cation Dopants in the A-Site on the Crystal Structure, Microstructure, and Electrical Conductivity of Ba0.5Sr0.5Co0.8Fe0.2O3-\delta as a New Solid-Oxide-Fuel-Cell Cathode
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概要
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(Ba0.5Sr0.5)1-xCaxCo0.8Fe0.2O3-\delta (BSCCF), (Ba0.5Sr0.5)0.8La0.2Co0.8Fe0.2O3-\delta (BSLCF), and (Ba0.5Sr0.5)0.8La0.2-xCaxCo0.8Fe0.2O3-\delta (BSLCCF) perovskite oxides were synthesized by the modified citrate method and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). These oxides showed primarily a cubic phase with their dense bodies after sintering. The lattice parameter was decreased with increasing Ca2+-ion content in BSCCF. Conversely, the substitution of Ca2+ ions for La3+ ions in BSLCCF increased the lattice parameter. The maximum electrical conductivities were 96 S$\cdot$cm-1 at 650 °C for the 30 mol % Ca2+-substituted BSCCF and 353 S$\cdot$cm-1 at 350 °C for BSLCF. The thermal expansion coefficient (TEC) of BSCCF was almost constant regardless of the Ca2+-ion contents, whereas that of BSLCCF decreased with decreasing Ca2+-ion content.
- 2011-01-25
著者
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SATO Kazunori
Department of Biology, Faculty of Science, Kyushu University
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Sato Kazunori
Department of Environmental Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
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Deehasing Suwichar
Department of Petrochemistry and Polymer Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
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Saguanruang Oravan
Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
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Chaianansutcharit Soamwadee
Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
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