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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Thermoelectric property of fine-grained CoSb3 skutterudite compound fabricated by mechanical alloying and spark plasma sintering
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Thermoelectric property of fine-grained CoSb3 skutterudite compound fabricated by mechanical alloying and spark plasma sintering

机译：机械合金化和电火花等离子烧结制备CoSb3方钴矿细粉化合物的热电性能

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摘要

Skutterudite CoSb3 polycrystalline materials were prepared using a combined process of mechanical alloying ( MA) and spark plasma sintering ( SPS). The influence of SPS temperature on the thermoelectric properties was focused in this work with a special emphasis on the analysis of the size effects of grains. The average grain sizes decreased from 300 to 50 nm with decreasing SPS temperatures from 600 to 300 degrees C. The electrical resistivities of samples spark plasma sintered at 300-600 degrees C all decreased with increasing temperature, indicating a classic intrinsic conduction behaviour of semiconductors. The samples spark plasma sintered at 300-500 degrees C showed a positive Seebeck coefficient while the sample spark plasma sintered at 600 degrees C showed a negative Seebeck coefficient. The room-temperature thermal conductivities were reduced from 4.30 to 2.92 W m(-1) K-1 as the grain sizes were decreased from 300 to 100 nm corresponding to SPS at 600 and 400 degrees C, respectively. The present work indicates that MA and SPS is a good combination for fabricating fine-grained CoSb3 thermoelectric materials.
机译：Skutterudite CoSb3多晶材料是采用机械合金化（MA）和火花等离子体烧结（SPS）的组合工艺制备的。 SPS温度对热电性能的影响集中在这项工作中，其中特别着重于晶粒尺寸效应的分析。随着SPS温度从600降低到300摄氏度，平均晶粒尺寸从300纳米降低到50纳米。在300-600摄氏度烧结的等离子体火花样品的电阻率均随温度升高而降低，这表明半导体具有经典的固有导电特性。在300-500摄氏度下烧结的样品火花等离子体显示出正的塞贝克系数，而在600摄氏度下烧结的样品火花等离子体显示出负的塞贝克系数。随着晶粒尺寸从300 nm减小到100 nm，分别对应于600和400摄氏度下的SPS，室温热导率从4.30降低到2.92 W m（-1）K-1。目前的工作表明，MA和SPS是制造细粒CoSb3热电材料的良好组合。

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