In situ synthesis and thermoelectric properties of (Fe/Ni)xCo4−xSb12 compounds by SPS
In situ synthesis and thermoelectric properties of (Fe/Ni)xCo4−xSb12 compounds by SPS
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DOI：
10.1016/j.jallcom.2007.02.111
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发表时间：
2008-06
影响因子：
6.2
通讯作者：
X. Zhang;Q. Lu;Jie Zhang;Q. Wei;Danmin Liu;Yaming Liu
中科院分区：
文献类型：
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作者：
X. Zhang;Q. Lu;Jie Zhang;Q. Wei;Danmin Liu;Yaming Liu
以Co、Sb、Fe和Ni粉末为原料，采用放电等离子烧结（SPS）技术，在800- 1000 K温度下制备了方钴矿（Fe/Ni）xCo 4 − xSb 12（x=0 ~ 1.0）化合物。系统研究了（Fe/Ni）xCo 4 − xSb 12（x=0-1.0）化合物的热电性能。结果表明，p型FexCo 4 − xSb 12化合物的热导率和晶格热导率随着Fe填充分数的增加而降低.当Ni填充分数为0.2时，n型NixCo 4 − xSb 12化合物的热导率达到最小值，随着Ni含量的增加，晶格热导率明显降低。（Fe/Ni）xCo 4 − xSb 12化合物的电导率和载流子浓度随Fe、Ni含量的增加而增加，Seebeck系数随Fe、Ni含量的增加而减小。与Fe替代相比，Ni填充对CoSb 3基方钴矿化合物热电性能的优化有更积极的作用。在本研究中，n型Ni0.2Co3.8Sb12在800 K时获得了最大ZT值0.6。
The skutterudite (Fe/Ni)xCo4−xSb12(x=0–1.0) compounds were prepared by spark plasma sintering (SPS) technique at 800–1000K using Co, Sb, Fe and Ni powder as raw materials. The thermoelectric properties of (Fe/Ni)xCo4−xSb12(x=0–1.0) compounds are investigated systematically. The results indicate that the thermal conductivity and lattice thermal conductivity of p-type FexCo4−xSb12compounds decrease with the increasing Fe filling fraction. The thermal conductivity of n-type NixCo4−xSb12compounds reach the minimum value when the Ni filling fraction is 0.2, and the lattice thermal conductivity reduce evidently with the increasing Ni content. The electrical conductivity and carrier concentration of (Fe/Ni)xCo4−xSb12compounds increase with the increasing Fe, Ni content, and the Seebeck coefficient decreases with the increasing Fe, Ni content. In contrast with Fe substitution, Ni filling shows a more positive effect on the optimization of thermoelectric properties of CoSb3-based skutterudite compounds. In this study, the obtained maximum ZT value reaches 0.6 for n-type Ni0.2Co3.8Sb12at 800K.