Thermal and chemical expansion of mixed conducting La0.5Sr0.5Fe1?xCoxO3?δ materials |
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| Institution: | 1. Department of Applied Physics, Chongqing University, Chongqing 400044, PR China;2. Department of Physics, COMSATS Institute of Information Technology, Lahore 54000, Pakistan;3. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, PR China;1. Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials & Ministry of Education, Hubei Key Laboratory of Polymer Materials, Hubei University, Wuhan, 430062, PR China;2. School of Energy and Power Engineering, Nanjing University of Science and Technology, 200 Xiaolingwei Street, Nanjing, Jiangsu Province, 210094, China;3. Department of Energy Conversion and Storage, Technical University of Denmark, Roskilde, 4000, Denmark;1. School of Engineering, University of Warwick, Coventry CV4 7AL, UK;2. Department of Chemical & Process Engineering, University of Strathclyde, Glasgow G1 1XJ, UK |
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| Abstract: | Oxygen deficiency, thermal and chemical expansion of La0.5Sr0.5Fe1?xCoxO3?δ (x = 0, 0.5, 1) have been measured by thermogravimetry, dilatometry and high temperature X-ray diffraction. The rhombohedral perovskite materials transformed to a cubic structure at 350 ± 50 °C. The thermal expansion of the materials up to the onset of thermal reduction was 14–18 × 10? 6 K? 1. Above 500 °C in air (400 °C in N2), chemical expansion contributed to the thermal expansion and the linear thermal expansion coefficients were significantly higher, 16–35 × 10? 6 K? 1. The chemical expansion, εc, showed a maximum of 0.0045 for x = 0.5 and 0.0041 for x = 1 at 800–900 °C. The normalized chemical expansion, εc/Δδ, was 0.036 for x = 0.5 and 0.035 for x = 1 at 800 °C. The chemical expansion can be correlated with an increasing ionic radius of the transition metals with decreasing valence state. |
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