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• W1990336312 abstract "Abstract The structure, electronic conductivity and electrochemical properties of the oxide perovskites with the Ln 0.5 M 0.5 FeO 3 − δ composition (Ln = La, Sm; M = Ba, Sr) are studied in the context of their possible use as cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). The main objective of the work is to analyse the influence of the A-site cation size disorder ( σ 2 ( r A )) on the properties of these compounds. The A-site cation size disorder of these samples varies from 0.0286 to 0.089 A 2 , whilst the doping (x) and the average ionic radius of the A-site cations ( r A >) are fixed to 0.5 and ~ 1.30 A, respectively. The samples are prepared using the glycine-nitrate method. X-ray powder diffraction (XRD) shows that all of the compounds have rhombohedral symmetry (space group: R- 3 c ). The structure is highly dependent on σ 2 ( r A ); the lattice parameters and unit cell volume decrease with decreasing σ 2 ( r A ). All of the samples have a porous microstructure with fine grain sizes (100–250 nm). The electrical conductivity ( σ ) measurements on the bulk samples shows a strong dependence on the A-site cation size disorder. Electrochemical impedance spectroscopy (EIS) measurements of the cathodes on the yttria-stabilised zirconia (YSZ) electrolyte-based symmetrical cells indicate that the lowest polarisation resistance value is observed for the sample with the lowest σ 2 ( r A ). The effect of introducing a samarium doped ceria (SDC) interlayer between the best performing cathode and the electrolyte is also studied." @default.
• W1990336312 created "2016-06-24" @default.
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• W1990336312 date "2013-03-01" @default.
• W1990336312 modified "2023-10-15" @default.
• W1990336312 title "Structure and properties of perovskites for SOFC cathodes as a function of the A-site cation size disorder" @default.
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• W1990336312 doi "https://doi.org/10.1016/j.ssi.2013.01.010" @default.
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