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Electrical properties of Ca3-xSmxCo4O9+δ ceramics preparedunder magnetic field |
| Xiu-Rong Qu(曲秀荣)1,2, Yan-Yan Xu(徐岩岩)1, Shu-Chen Lü(吕树臣)1, Jian-Min Hu(胡建民)1 |
1 Key Laboratory of Photonic and Electric Bandgap Materials, and School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, China;
2 School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China |
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Abstract 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 coefficient α increases. As a result, the power factor (PF=α2/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 Co4+ state in the CoO2 layer of CCO is also increased as the magnetic field is used in the preparing process, which results in an enhanced α. 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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Received: 17 August 2019
Revised: 01 February 2020
Accepted manuscript online:
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PACS:
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61.72.S-
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(Impurities in crystals)
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63.22.Np
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(Layered systems)
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72.15.Jf
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(Thermoelectric and thermomagnetic effects)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51302055). |
Corresponding Authors:
Xiu-Rong Qu
E-mail: quxiurong2002@163.com
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Cite this article:
Xiu-Rong Qu(曲秀荣), Yan-Yan Xu(徐岩岩), Shu-Chen Lü(吕树臣), Jian-Min Hu(胡建民) Electrical properties of Ca3-xSmxCo4O9+δ ceramics preparedunder magnetic field 2020 Chin. Phys. B 29 046103
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