Crystal structure,thermal expansion and electrical conductivity of perovskite oxides BaxSr1−xCo0.8Fe0.2O3−δ (0.3 ≤ x ≤ 0.7) |
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| Affiliation: | 1. Center for Condensed Matter Science and Technology, Harbin Institute of Technology, Harbin 150001, PR China;2. Key Laboratory of the Condensed-Matter Science and Technology, Harbin Institute of Technology, HeiLongJiang Provincial Universities, Harbin 150001, PR China;3. Department of Physics, Jilin University, Changchun 130023, PR China;4. International Center for Materials Physics, Academia Sinica, Shenyang 110015, PR China;1. College of chemistry and materials engineering, Bohai University, Jinzhou 121013, China;2. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;1. Department of Chemical Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India;2. Department of Applied Chemistry and Polymer Technology, Delhi Technological University (DTU), New Delhi 110042, India;3. Computer Services Centre, Indian Institute of Technology Delhi, New Delhi 110016, India;4. Dassault Systemes, Galleria Commercial Tower, 23 Old Airport Road, Bangalore 560008, India;5. Department of Chemical Engineering, Indian Institute of Technology Kharagpur, West Bengal 721302, India |
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| Abstract: | BaxSr1−xCo0.8Fe0.2O3−δ (0.3 ≤ x ≤ 0.7) composite oxides were prepared and characterized. The crystal structure, thermal expansion and electrical conductivity were studied by X-ray diffraction, dilatometer and four-point DC, respectively. For x ≤ 0.6 compositions, cubic perovskite structure was obtained and the lattice constant increased with increasing Ba content. Large amount of lattice oxygen was lost below 550 °C, which had significant effects on thermal and electrical properties. All the dilatometric curves had an inflection at about 350–500 °C, and thermal expansion coefficients were very high between 50 and 1000 °C with the value larger than 20 × 10−6 °C−1. The conductivity were larger than 30 S cm−1 above 500 °C except for x > 0.5 compositions. Furthermore, conductivity relaxation behaviors were also investigated at temperature 400–550 °C. Generally, Ba0.4Sr0.6Co0.8Fe0‘2O3−δ and Ba0.5Sr0.5Co0.8Fe0.2O3−δ are potential cathode materials. |
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