LFN and LSCFN perovskites — structure and transport properties |
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| Institution: | 1. Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany;2. Institute of Physics IA, RWTH Aachen University, 52074 Aachen, Germany;3. Jülich–Aachen Research Alliance (JARA-FIT and JARA-HPC), RWTH Aachen University, 52074 Aachen, Germany;1. School of Metallurgy and Resources, Anhui University of Technology, Maanshan, Anhui 243002, PR China;2. Laboratory of Advanced Functional Materials and Devices, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, PR China;1. CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences (SICCAS), 588 He-shuo Road, Shanghai, 201800, China;2. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 588 He-shuo Road, Shanghai, 201800, China;3. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China |
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| Abstract: | Structural, electronic and transport properties of LFN (LaFe1?zNizO3) and LSCFN (La1?xSrxCo1?y ?zFeyNizO3) perovskites synthesized by a modified citric acid method were studied. Structure of the samples was characterized by X-ray studies with Rietveld method analysis. Magnetic properties and valence states of iron ions were characterized by 57Fe Moessbauer spectroscopy performed at RT, which were found to be greatly dependent on the chemical composition of the samples. Electrical conductivity was measured in the 20–800 °C temperature range and for some compositions relatively high values (exceeding 100 S cm? 1) were observed in the 600–800 °C range. Chemical stability studies in relation to Ce0.8Gd0.2O1.9 electrolyte, performed for selected perovskite samples, revealed decreasing stability with increasing Ni concentration and formation of solid solutions in CGO/perovskite composites. The coefficient of thermal expansion (CTE) of LFN perovskites was found to match that of CGO electrolyte (CTE in the 10–13 · 10? 6 K? 1 range). |
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