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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effects of Tl-filling into the voids and Rh substitution for Co on the thermoelectric properties of CoSb_3
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Effects of Tl-filling into the voids and Rh substitution for Co on the thermoelectric properties of CoSb_3

机译：Tl填充到空隙中和Rh置换Co对CoSb_3热电性能的影响

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摘要

In order to enhance the thermoelectric (TE) properties of CoSb_3, we tried to reduce the lattice thermal conductivity (ê_(lat)) by filling Tl into the voids and substitution of Rh for Co. We prepared polycrystalline samples of Tl_x(Co_(1-y)Rh_y)_4Sb_(12) (x = 0,0.05,0.10,0.15,0.20 and y = 0.1,0.2) and examined their TE properties from room temperature to 750 K. All the samples indicated negative values of the Seebeck coefficient (S). Both the electrical resistivity and the absolute values of the S decreased with increasing the Tl-filling ratio. The Tl-filling and Rh substitution reduced the ê_(lat), due to the rattling and the alloy scattering effects. The minimum value of the ê_(lat) was 1.54 W m~(-1) K~(-1) at 550K obtained for Tl_(0.20)(Co_(0.8)Rh_(0.2))_4Sb_(12). Tl_(0.20)(Co_(0.8)Rh_(0.2))_4Sb_(12) exhibited the best TE performance; the maximum value for the dimensionless figure of merit ZT was 0.58 at around 600 K.
机译：为了增强CoSb_3的热电（TE）特性，我们试图通过将Tl填充到空隙中并用Rh代替Co来降低晶格热导率（ê_（lat））。我们制备了Tl_x（Co_（1 -y）Rh_y）_4Sb_（12）（x = 0,0.05,0.10,0.15,0.20和y = 0.1,0.2）并检查了其从室温到750 K的TE特性。所有样本均显示塞贝克系数为负值（S）。电阻率和S的绝对值都随着T1填充率的增加而降低。由于嘎嘎声和合金散射效应，Tl填充和Rh取代降低了ê_（lat）。对于Tl_（0.20）（Co_（0.8）Rh_（0.2））_ 4Sb_（12）获得的550K的最小值为1.54 W m〜（-1）K〜（-1）。 Tl_（0.20）（Co_（0.8）Rh_（0.2））_ 4Sb_（12）表现出最佳的TE性能;品质因数ZT的最大值在600 K左右为0.58。

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