Sm掺杂对Ca3Co4O9+δ基化合物高温热电性能的影响

无机材料学报, 2004, 19(6): 1329-1333.

Sm掺杂对Ca₃Co₄O_9+δ基化合物高温热电性能的影响

王东立 , 陈立东 , 柏胜强 , 李建国

1.1. 上海交通大学材料科学与工程学院上海 200030

2. 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

1.1. School of Materials Science and Engineering

Shanghai Jiaotong University

Shanghai 200030

Shanghai Institute of Ceramics

Chinese Academy of Sciences

Shanghai 200050

China

关键词： Seebeck系数 , thermoelectric material , figure of merit

Effects of Sm Doping on the High Temperature Thermoelectric Properties of Ca₃Co₄O_9+δ-based Compounds

WANG Dong-Li , CHEN Li-Dong , BAI Sheng-Qiang , LI Jian-Guo

Keywords： Seebeck coefficients , 热电材料 , 品质因子

用溶胶-凝胶法合成了Ca_3-xSm_xCo₄O_9+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.

Ca_3-xSm_xCo₄O_9+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 Ca₃Co₄O_9+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 Ca_2.7Sm_0.3Co₄O_9+δ.

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