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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

Sm掺杂对Ca3Co4O9+δ基化合物高温热电性能的影响

王东立1,2; 陈立东2; 柏胜强2; 李建国1   

  1. 1. 上海交通大学材料科学与工程学院 上海 200030; 2. 中国科学院上海硅酸盐研究所高性能陶瓷与超微结构国家重点实验室;上海 200050
  • 收稿日期:2003-10-08 修回日期:2003-11-18 出版日期:2004-11-20 网络出版日期:2004-11-20

Effects of Sm Doping on the High Temperature Thermoelectric Properties of Ca3Co4O9+δ-based Compounds

WANG Dong-Li1,2; CHEN Li-Dong2; BAI Sheng-Qiang2; LI Jian-Guo1   

  1. 1. School of Materials Science and Engineering; Shanghai Jiaotong University; Shanghai 200030; China; 2. State Key Laboratory of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:2003-10-08 Revised:2003-11-18 Published:2004-11-20 Online:2004-11-20

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摘要： 用溶胶-凝胶法合成了Ca3-xSmxCo4O9+δ(x=0,0.15,0.3和0.45)化合物粉体,并用SPS(Spark Plasma Sintering)烧结方法制备出相对密度>95％的块体材料.研究了Sm掺杂对其高温热电性能的影响.结果表明:在Ca位用Sm替代后材料的Seebeck系数和电阻率都增大,热导率降低.当Sm的掺杂量为10％(即 x=0.3)时可获得最佳的热电性能,1000K时它的ZT值可达0.3.

关键词: Seebeck系数, 热电材料, 品质因子

Abstract: Ca3-xSmxCo4O9+δ(x=0, 0.15, 0.3 and 0.45) polycrystalline samples were prepared by using
sol-gel process followed by SPS sintering. Their thermoelectric properties were carefully studied from room temperature to 1000K. The substitution of
Sm for Ca results in the increase of both Seabeck coefficient and electrical resistivity, which could be attributed to the decrease of carrier concentrations.
The Sm substituted samples (x=0.15, 0.3) have lower thermal conductivity than Ca3Co4O9+δ due to their lower electronic and lattice
thermal conductivities. The dimensionless figure of merit ZT reaches 0.3 at 1000K for the sample of Ca2.7Sm0.3Co4O9+δ.

Key words: Seebeck coefficients, thermoelectric material, figure of merit

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