Solubility Study of Y in n-type YxCe0.15Co4Sb12 Skutterudites and its Effect on Thermoelectric Properties

Solubility Study of Y in n-type YxCe0.15Co4Sb12 Skutterudites and its Effect on Thermoelectric Properties
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Y在n型YxCe0.15Co4Sb12方钴矿中的溶解度研究及其对热电性能的影响

DOI:
10.1016/j.mtphys.2020.100206
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发表时间:
2020-06
影响因子:
11.5
通讯作者:
Jiehe Sui
Jiehe Sui
中科院分区:
材料科学2区
文献类型:
--
作者:
D;an Qin;Wenjing Shi;Wenhua Xue;Haixu Qin;Jian Cao;Wei Cai;Yumei Wang;Jiehe Sui

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廉价的Ce被证明是CoSb 3基方钴矿中性能调节的有效辅助填料,方钴矿是最有前途的中温热电材料之一。然而,Ce在CoSb 3中的低溶解度使得其整体热电性能远不如具有昂贵且稀缺的Yb填料的热电性能。本文采用非平衡法合成了一系列以Ce为主要填充元素、Y为辅助填充元素的双填充方钴矿。我们的研究表明,Y填充不仅优化了载流子浓度,从而提高了整体功率因数,但也引入了额外的声子散射,从而导致显着抑制晶格热导率。Y0.05Ce0.15Co4Sb12样品在873 K时的电学和热学性能达到了最大值,ZT约为1.37,优于其他Ce单填充甚至双填充的方钴矿,这将有利于填充方钴矿的广泛应用。
Low-cost Ce has been proved to be an effective auxiliary filler for performance tuning in CoSb3-based skutterudite, one of the most promising thermoelectric materials at medium temperature. However, the low solubility of Ce in CoSb3makes its overall thermoelectric properties so far inferior to that with expensive and scarce Yb filler. Herein, using non-equilibrium processing, we successfully synthesized a series of double-filled skutterudites with Ce as the dominating filling element and Y as the auxiliary filler. Our investigation shows that Y filling not only optimizes the carrier concentration and thus enhances the overall power factor but also introduces additional phonon scattering and hence leads to significantly suppressed lattice thermal conductivity. The concurrently optimized electrical and thermal properties realize the maximumZTof ~1.37 at 873 K in the Y0.05Ce0.15Co4Sb12sample, prevailing over the other involved Ce single- or even double-filled skutterudites, which will potentially facilitate a widespread application of filled skutterudites.
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