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2009 , Vol. 24 >Issue 4: 803 - 807

DOI: https://doi.org/10.3724/SP.J.1077.2009.00803

研究论文

Te掺杂对SryCo4Sb12-xTex化合物热电性能的影响

  • 赵雪盈 ,
  • 柏胜强 ,
  • 李小亚 ,
  • 周燕飞 ,
  • 陈立东
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  • 1. 中国科学院 上海硅酸盐研究所 高性能陶瓷和超微结构国家重点实验室, 上海200050; 2. 中国科学院研究生院, 北京 100049

收稿日期: 2008-11-19

  修回日期: 2009-01-07

  网络出版日期: 2009-07-20

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Effect of Te Doping on Thermoelectric Property of SryCo4Sb12-xTex Compounds

  • ZHAO Xue-Ying ,
  • BAI Sheng-Qiang ,
  • LI Xiao-Ya ,
  • ZHOU Yan-Fei ,
  • CHEN Li-Dong
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  • 1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China

Received date: 2008-11-19

  Revised date: 2009-01-07

  Online published: 2009-07-20

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摘要

采用熔融法结合SPS烧结技术合成了SryCo4Sb12-xTex化合物, 并探讨了Te掺杂对化合物热电性能的影响. 采用XRD及EPMA确定了相组成及化学成分, 并测试了材料的高温热电性能. 实验结果表明, 虽然Te掺杂降低了Sr在CoSb3中的填充量, 但是与具有相近Sr填充量的基体相比, Te掺杂提高了材料的载流子浓度和电导率, 同时也提高了塞贝克系数; Te掺杂由于引入了电子-声子散射, 进一步降低了材料的晶格热导率, 并且随着Te掺杂量的增加, 晶格热导率的降低幅度提高; 对x=0.05的样品Sr0.18Co4Sb11.95Te0.05, 在850K时, 材料的最大ZT值接近1.0, 与具有相近填充量的基体材料相比, ZT值提高了35％.

关键词： Te 掺杂; SryCo4Sb12-xTex化合物; 热电传输性能

本文引用格式

赵雪盈 , 柏胜强 , 李小亚 , 周燕飞 , 陈立东 . Te掺杂对SryCo4Sb12-xTex化合物热电性能的影响[J]. 无机材料学报, 2009 , 24(4) : 803 -807 . DOI: 10.3724/SP.J.1077.2009.00803

Abstract

Skutterudite compounds, SryCo4Sb12-xTex, were synthesized by melting method and SPS method, the thermal and electrical properties were measured in the temperature range from 300K to 850K. Both carrier concentration and electrical conductivity of SryCo4Sb12-xTex compounds are higher than those of the matrix with similar Sr filling fraction. The magnitude of Seebeck coefficient is increased in comparison with that of matrix with similar carrier concentration, especially at high temperature. Lattice thermal conductivity is further decreased due to the extra electron-phonon scattering mode introduced by Te doping. The maximum ZT value of 1.0 is obtained for Sr0.18Co4Sb11.95Te0.05 at 850K, which is improved by 35% compared with that of Sr0.17Co4Sb12.

Key words： Te doping; SryCo4Sb12-xTex compound; thermoelectric transport properties

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