Electrical properties of Ca3-xSmxCo4O9+δceramics prepared under magnetic field |
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引用本文: | 曲秀荣,徐岩岩,吕树臣,胡建民.Electrical properties of Ca3-xSmxCo4O9+δceramics prepared under magnetic field[J].中国物理 B,2020(4):344-350. |
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作者姓名: | 曲秀荣 徐岩岩 吕树臣 胡建民 |
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作者单位: | Key Laboratory of Photonic and Electric Bandgap Materials;School of Materials Science and Engineering |
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基金项目: | Project supported by the National Natural Science Foundation of China(Grant No.51302055)。 |
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摘 要: | We fabricate Sm-doped Ca3Co4O9+δ(CCO)bulk materials in magnetic field during both processes of chemical synthesis and cold pressing.The structure and electrical performance of the samples are investigated.With the increasing Sm concentration,the electrical conductivity 1/ρ decreases and the Seebeck coefficientαincreases.As a result,the power factor(PF=α^2/ρ)is raised slightly.After applying magnetic field,the extent of texture,grain size and density of all the bulk materials are improved obviously,thereby an enhanced electrical conductivity can be gained.Additionally,the degeneracy of Co^4+ state in the CoO2 layer of CCO is also increased as the magnetic field is used in the preparing process,which results in an enhancedα.The Ca2.85Sm0.15Co4O9+δ prepared in magnetic field shows the largest power factor(0.20 mW·m^-1·K^-2 at 1073 K).
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关 键 词: | chemical preparation MAGNETIC field structure ELECTRICAL CHARACTERISTIC |
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