中国物理B ›› 2020, Vol. 29 ›› Issue (4): 46103-046103.doi: 10.1088/1674-1056/ab75cb

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Electrical properties of Ca3-xSmxCo4O9+δ ceramics preparedunder magnetic field

Xiu-Rong Qu(曲秀荣), Yan-Yan Xu(徐岩岩), Shu-Chen Lü(吕树臣), 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
  • 收稿日期:2019-08-17 修回日期:2020-02-01 出版日期:2020-04-05 发布日期:2020-04-05
  • 通讯作者: Xiu-Rong Qu E-mail:quxiurong2002@163.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 51302055).

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. 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
  • Received:2019-08-17 Revised:2020-02-01 Online:2020-04-05 Published:2020-04-05
  • Contact: Xiu-Rong Qu E-mail:quxiurong2002@163.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 51302055).

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 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).

关键词: chemical preparation, magnetic field, structure, electrical characteristic

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).

Key words: chemical preparation, magnetic field, structure, electrical characteristic

中图分类号:  (Impurities in crystals)

  • 61.72.S-
63.22.Np (Layered systems) 72.15.Jf (Thermoelectric and thermomagnetic effects)