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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Multiband Transport in CoSb3 Prepared by Rapid Solidification
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Multiband Transport in CoSb3 Prepared by Rapid Solidification

机译：快速凝固制备的CoSb3中的多带传输

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摘要

Nano-grained CoSb3 was prepared by melt-spinning and subsequent spark plasma sintering. The phonon thermal conductivity of skutterudites is known to be sensitive to the kind and the amount of guest atoms. Thus, unfilled CoSb3 can serve as model compound to study the impact of a nanostructure on the thermoelectric properties, especially the phonon thermal conductivity. Therefore, a series of materials was prepared differing only by the cooling speed during the quenching procedure. In contrast to clathrates, the microstructure of meltspun CoSb3 was found to be sensitive to the cooling speed. Although the phonon thermal conductivity, studied by means of Flash and 3 omega measurements, was found to be correlated with the grain size, the bulk density of the sintered materials had an even stronger impact. Interestingly, the reduced bulk density did not result in an increased electrical resistivity. The influence of Sb and CoSb2 as foreign phase on the electronic properties of CoSb3 was revealed by a multi-band Hall effect analysis. While CoSb2 increases the charge carrier density, the influence of the highly mobile charge carriers introduced by elemental Sb on the thermoelectric properties of the composite offer an interesting perspective for the preparation of efficient thermoelectric composite materials.
机译：通过熔融纺丝和随后的火花等离子体烧结制备了纳米CoSb3。已知方钴矿的声子热导率对客体原子的种类和数量敏感。因此，未填充的CoSb3可以用作模型化合物，以研究纳米结构对热电性质（尤其是声子热导率）的影响。因此，准备了一系列材料，只是淬火过程中的冷却速度不同。与包合物相反，发现熔纺CoSb3的微观结构对冷却速度敏感。尽管通过闪光和3Ω测量研究了声子的热导率，发现其与晶粒尺寸相关，但烧结材料的堆积密度甚至有更大的影响。有趣的是，降低的堆积密度并未导致电阻率的增加。通过多带霍尔效应分析揭示了Sb和CoSb2作为外相对CoSb3电子性能的影响。尽管CoSb2增加了电荷载流子密度，但元素Sb引入的高迁移率电荷载流子对复合材料热电性能的影响为制备有效的热电复合材料提供了有趣的视角。

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