Journal ArticleDOI
Computational prediction of high thermoelectric performance in p-type half-Heusler compounds with low band effective mass
TLDR
First-principles based methods are used to predict a very high zT value of 1.54 at 1200 K in p-type RuTaSb HH alloys, demonstrating that the p-types are promising as TE materials for high temperature power generation.Abstract:
Half-Heusler (HH) compounds are important high temperature thermoelectric (TE) materials and have gained ever-increasing popularity. In recent years, p-type FeNbSb-based heavy-band HH compounds have attracted considerable attention with the record-high zT value of 1.5. Here, we use first-principles based methods to predict a very high zT value of 1.54 at 1200 K in p-type RuTaSb alloys. The high band degeneracy and low band effective mass contribute to a high power factor. Although the electrical thermal conductivity is high due to the high carrier mobility and hence electrical conductivity, the total thermal conductivity is moderate because of the low lattice thermal conductivity. The predicted high zT demonstrates that the p-type RuTaSb HH alloys are promising as TE materials for high temperature power generation.read more
Citations
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Journal Article
Stronger phonon scattering by larger differences in atomic mass and size in p-type half-Heuslers Hf$_{1-x}$Ti$_{x}$CoSb$_{0.8}$Sn$_{0.2}$
Xiao Yan,Weishu Liu,Haiyan Wang,Shuo Chen,Junichiro Shiomi,Hengzhi Wang,Dezhi Wang,Gang Chen,Zhifeng Ren +8 more
TL;DR: In this article, a lower thermal conductivity in p-type half-Heuslers was achieved when Ti is used to replace Zr, i.e., Hf1−xTixCoSb0.8Sn0.2, due to larger differences in the atomic mass and size between Hf and Ti.
Journal ArticleDOI
Unique Role of Refractory Ta Alloying in Enhancing the Figure of Merit of NbFeSb Thermoelectric Materials
Junjie Yu,Chenguang Fu,Yintu Liu,Kaiyang Xia,Umut Aydemir,Thomas C. Chasapis,G. Jeffrey Snyder,Xinbing Zhao,Tiejun Zhu +8 more
TL;DR: In this article, a Ta-alloyed (Nb1−xTax) 0.8Ti0.4 (x = 0.36 and 0.4) solid solution with significantly reduced thermal conductivity by levitation melting is reported.
Journal ArticleDOI
High performance p-type half-Heusler thermoelectric materials
Journal ArticleDOI
On the Half-Heusler compounds Nb 1-x {Ti,Zr,Hf} x FeSb: Phase relations, thermoelectric properties at low and high temperature, and mechanical properties
A. Tavassoli,F. Failamani,A. Grytsiv,A. Grytsiv,Gerda Rogl,Gerda Rogl,P. Heinrich,Herbert Müller,E. Bauer,Michael J. Zehetbauer,Peter Rogl +10 more
TL;DR: In this paper, a re-investigation of phase equilibria, crystal structure and homogeneity region of the Half-Heusler (HH) phase in the ternary system Nb-Fe-Sb at 600°C has solved controversies in the literature confirming the version of Melnyk et al.
Journal ArticleDOI
Enhancing thermoelectric performance of FeNbSb half-Heusler compound by Hf-Ti dual-doping
TL;DR: In this article, the performance of FeNb 0.9- x Hf 0.1 Ti x Sb (0 ≤ x ≤ ≤ 0.32) was improved by dual-doping.
References
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Journal ArticleDOI
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