Synthesis and characterization of doped apatite-type lanthanum silicates for SOFC applications |
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Authors: | H. Gasparyan S. NeophytidesD. Niakolas V. Stathopoulos T. KharlamovaV. Sadykov O. Van der BiestE. Jothinathan E. LouradourJ.-P. Joulin S. Bebelis |
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Affiliation: | a Department of Chemical Engineering, University of Patras, GR 26504 Patras, Greeceb Institute of Chemical Engineering and High Temperature Chemical Processes (FORTH/ICE-HT), GR 26504 Patras, Greecec CERECO S.A.-Ceramics and Refractories Technological Development Company, GR 34100 Chalkida, Greeced Department of Applied Sciences, Technological Educational Institute of Chalkida, GR 34400 Psahna, Greecee Boreskov Institute of Catalysis SB RAS, 630090 Novosibirsk, Russiaf Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgiumg CTI — Céramiques Techniques et Industrielles SA, F-30340 Salindres, France |
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Abstract: | A series of iron- and/or aluminium-doped apatite-type lanthanum silicates (ATLS) La9.83Si6 ‐ x ‐ yAlxFeyO26 ± δ (x = 0, 0.25, 0.75, and 1.5, y = 0, 0.25, 0.75, and 1.5) were synthesized using the mechanochemical activation (MA), solid state reaction (SSR), Pechini (Pe) and sol-gel (SG) methods. The total conductivity of the prepared materials was measured under air in the temperature range 600-850 °C using 4-probe AC impedance spectroscopy. Its dependence on composition, synthesis method, sintering conditions and powder particle size was investigated. It was found that for electrolytes of the same composition, those prepared via mechanochemical activation exhibited the highest total specific conductivity, which was improved with increasing Al- and decreasing Fe-content. The highest conductivity value at 700 °C, equal to 2.04 × 10− 2 S cm− 1, was observed for the La9.83Si5Al0.75Fe0.25O26 ± δ electrolyte. La9.83Si4.5Fe1.5O26 ± δ electrolyte samples synthesized using the Pechini method exhibited higher conductivity when sintered conventionally than when spark-plasma sintering (SPS) was used. |
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Keywords: | Apatites Lanthanum silicates Oxide ion conductors Solid oxide fuel cells SOFC |
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