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The effects of Yb11Sb10 and Yb10MnSb9 secondary phases on the high performing thermoelectric material Yb14MnSb11
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2024-09-09 , DOI: 10.1039/d4ta04606d
Leah Borgsmiller 1 , G. Jeffrey Snyder 1
Affiliation  

The Yb11Sb10 Zintl phase has long been reported to be a negative secondary phase in the high performing Yb14MSb11 (M = Mn, Mg, Zn) (14-1-11) thermoelectric material. However there have been discrepancies in the literature regarding the effect of this Yb11Sb10 phase on the thermoelectric performance of 14-1-11 compounds. The recent discovery of Yb10MnSb9 is used here to explain these inconsistencies. Yb11Sb10 and Yb10MnSb9 are very close materials stoichiometrically and crystallographically. However, despite these similarities, these materials exhibit very different transport properties and thus should have differing impacts on the overall thermoelectric performance of 14-1-11. In this work, we consider how these two phases affect the thermoelectric performance of Yb14MnSb11 when present as secondary phases both through an experimental investigation and an effective medium theory model. Secondary phases in thermoelectrics are often regarded as a consistently negative effect and yet here we show that while the presence of Yb11Sb10 in Yb14MnSb11 reduces the thermoelectric performance, the presence of Yb10MnSb9, even in large amounts does not dramatically reduce the thermoelectric performance and is shown here to even improve performance. This work provides a deeper understanding of previous works regarding 14-1-11 materials and Yb–Mn–Sb phases and paves the way towards practical application.

中文翻译:


Yb11Sb10和Yb10MnSb9第二相对高性能热电材料Yb14MnSb11的影响



长期以来,Yb 11 Sb 10 Zintl 相一直被报道为高性能 Yb 14 MSb 11 (M = Mn、Mg、Zn) (14-1-11) 热电材料中的负第二相。然而,文献中关于该Yb 11 Sb 10相对14-1-11化合物热电性能的影响存在差异。这里使用最近发现的 Yb 10 MnSb 9来解释这些不一致之处。 Yb 11 Sb 10和Yb 10 MnSb 9是化学计量和晶体学上非常接近的材料。然而,尽管有这些相似之处,这些材料表现出非常不同的传输特性,因此对 14-1-11 的整体热电性能应该有不同的影响。在这项工作中,我们通过实验研究和有效介质理论模型来考虑这两个相作为第二相存在时如何影响 Yb 14 MnSb 11的热电性能。 热电中的二次相通常被认为是一种持续的负面影响,但在这里我们表明,虽然 Yb 14 MnSb 11中 Yb 11 Sb 10的存在会降低热电性能,但 Yb 10 MnSb 9的存在,即使大量存在也不会降低热电性能。显着降低热电性能,此处显示甚至可以提高性能。这项工作使人们对 14-1-11 材料和 Yb-Mn-Sb 相的先前工作有了更深入的了解,并为实际应用铺平了道路。
更新日期:2024-09-09
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