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首页> 外文期刊>Materials Chemistry and Physics >Solvothermal Synthesis Of Nano-sized Skutterudite Co_(4-x)fe_xsb_(12) Powders
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Solvothermal Synthesis Of Nano-sized Skutterudite Co_(4-x)fe_xsb_(12) Powders

机译：溶剂热合成纳米Skutterudite Co_（4-x）fe_xsb_（12）粉末

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摘要

Nanostructuring is one of the effective approaches to lower the thermal conductivity of thermoelectric materials for improving its figure of merit. The nano-sized uniform skutterudite Co_(4-x)Fe_xSb_(12) (x = 0, 0.3, 0.5, 0.8 and 1.0) thermoelectric powders were synthesized in triethylene glycol solution by using CoCl_2, FeCl_3 and SbCl_3 as precursors and NaBH_4 as reductant. Different synthesis conditions were studied to pursue pure and uniform skutterudite CoSb_3 powders. The mechanism of formation and growth of CoSb_3 particles were discussed based on the thermodynamics assessment of the Co-Sb system. The powders were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and energy-dispersive X-ray (EDX) analysis. Experiment shows that a Fe-doped skutterudite Co_(4-x)Fe_xSb_(12) single phase was obtained at 290 ℃ for 12 h. The powders are of spherical form, small and uniform. As x increases from 0 to 1.0, the lattice parameter of Co_(4-x)Fe_xSb_(12) increases from α = 0.9044 to 0.9060 nm, and the particle size increases from 10 to 20 nm.
机译：纳米结构是降低热电材料导热系数以改善其品质因数的有效方法之一。以CoCl_2，FeCl_3和SbCl_3为前驱体，NaBH_4为还原剂，在三甘醇溶液中合成了纳米级均匀方钴矿Co_（4-x）Fe_xSb_（12）（x = 0、0.3、0.5、0.8和1.0）热电粉末。 。研究了不同的合成条件，以追求纯净和均匀的方钴矿CoSb_3粉末。基于Co-Sb系统的热力学评估，探讨了CoSb_3颗粒的形成和生长机理。通过X射线衍射（XRD），场发射扫描电子显微镜（FESEM）和能量色散X射线（EDX）分析对粉末进行了表征。实验表明，在290℃，12 h的条件下，得到了Fe掺杂的方钴矿Co_（4-x）Fe_xSb_（12）单相。这些粉末是球形的，小的且均匀的。当x从0增加到1.0时，Co_（4-x）Fe_xSb_（12）的晶格参数从α= 0.9044增加到0.9060 nm，粒径从10增加到20 nm。

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