High temperature thermoelectric properties of CoSb3 skutterudites with PbTe inclusions
High temperature thermoelectric properties of CoSb3 skutterudites with PbTe inclusions
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DOI：
10.1007/s10853-012-6891-3
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发表时间：
2013-04
影响因子：
4.5
通讯作者：
C. Chubilleau;B. Lenoir;P. Masschelein;A. Dauscher;C. Candolfi;E. Guilmeau;Claude Godart
中科院分区：
文献类型：
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作者：
C. Chubilleau;B. Lenoir;P. Masschelein;A. Dauscher;C. Candolfi;E. Guilmeau;Claude Godart
纳米结构热电材料通常表现出增强的性质。采用冷冻干燥法制备了PbTe纳米颗粒（粒径为6 nm，激光粉碎法制备）与方钴矿CoSb 3粉末（粒径为5 μm，粉末冶金法制备），然后采用放电等离子烧结法制备了PbTe-CoSb 3热电复合材料（PbTe含量为0-8 wt%）。进行了X射线衍射分析和扫描电子显微镜观察。显微结构揭示了团聚的PbTe颗粒在晶界的CoSb 3。在300-800 K温度范围内进行了电阻率、热电势和热导率测量。复合材料的导电类型为Bubtin型，而参比材料CoSb 3方钴矿的导电类型为P型。这种导电模式的变化归因于复合材料中微量的Te被Sb取代。详细讨论了碲化铅纳米颗粒和碲对热电性能的影响。
Nanostructured thermoelectric materials generally exhibit enhanced properties. PbTe–CoSb3thermoelectric composites (0–8 wt% of PbTe) have been successfully prepared by freeze-drying nanoparticles of PbTe (6 nm in diameter, synthesized by laser fragmentation of micron-sized particles in water) with micron-sized skutterudite CoSb3powders (~5 μm in diameter, synthesized by powder metallurgy), followed by spark plasma sintering. X-ray diffraction analyses and scanning electron microscopy observations have been performed. Microstructures reveal an agglomeration of the PbTe particles at the grain boundaries of CoSb3. Electrical resistivity, thermopower, and thermal conductivity measurements have been performed in the 300–800 K temperature range. The composites exhibitn-type conduction whereas the reference CoSb3skutterudite isp-type. This change of conduction mode is attributed to substitution of Sb for a minute amount of Te in the composites. The influence of both PbTe nanoparticules and Te on the thermoelectric properties is discussed in detail.