Effects of Co and Fe addition on the properties of lanthanum strontium manganite |
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| Affiliation: | 1. School of Ceramic Engineering at Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand;2. Department of Materials Science, Chulalongkorn University, Bangkok 10330, Thailand;3. National Metal and Materials Technology Center, Patumthani 12120, Thailand;1. Department of Civil, Chemical and Environmental Engineering, University of Genoa, Via Opera Pia 15, 16145 Genoa, Italy;2. Department of Energy Conversion and Storage, Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark;1. Key Laboratory of Thermal-Fluid Science and Engineering of MOE, School of Energy & Power Engineering, Xi''an Jiaotong University, 710049, China;2. Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, Xi''an Jiaotong University, Xi''an 710049, People''s Republic of China;1. Shandong University of Science and Technology, 579 Qianwangang Road, 266590, Qingdao, China;2. Dalian Institute of Chemical Physics, 457 Zhongshan Road, 116023, Dalian, China |
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| Abstract: | The effects of Co and Fe dopants with the amount of 20 and 40 mol% on the properties of La0.84Sr0.16MnO3 were investigated. All compositions were prepared by conventional mixed oxide process and sintered at 1450 °C. The structure of undoped and Co-doped compositions was found to be monoclinic. In addition, the second phase was observed in these sintered compositions. The conductivity of doped materials decreased as compared to that of La0.84Sr0.16MnO3. The SEM microstructure showed the decrease of grain size as Co content increased. The thermal expansion coefficient (TEC) tended to increase as Co content increased. In contrast, the monoclinic and orthorhombic structures were found in 20 and 40 mol% Fe-doped La0.84Sr0.16MnO3. The amount of second phase in sintered composition depends on the amount of Fe content. The conductivity at 1000 °C decreased, but the grain size increased as Fe content increased. The thermal expansion coefficient slightly changed with Fe addition. |
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