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  4. Thermoelectric properties of n-type half-Heusler NbCoSn with heavy-element Pt substitution
 
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2020
Journal Article
Title

Thermoelectric properties of n-type half-Heusler NbCoSn with heavy-element Pt substitution

Abstract
Half-Heusler compounds with a valence electron count of 18, including ZrNiSn, ZrCoSb, and NbFeSb, are good thermoelectric materials owing to favorable electronic structures. Previous computational studies had predicted a high electrical power factor in another half-Heusler compound NbCoSn, but it has not been extensively investigated experimentally. Herein, the synthesis, structural characterization, and thermoelectric properties of the heavy-element Pt-substituted NbCoSn compounds are reported. Pt is found to be an effective substitute enabling the optimization of electrical power factor and simultaneously leading to a strong point defect scattering of phonons and the suppression of lattice thermal conductivity. Post-annealing significantly improves the carrier mobility, which is ascribed to the decreased grain boundary scattering of electrons. As a result, a maximum power factor of ∼3.4 mW m−1 K−2 is obtained at 600 K. In conjunction with the reduced lattice thermal conductivity, a maximum figure of merit zT of ∼0.6 is achieved at 773 K for the post-annealed NbCo0.95Pt0.05Sn, an increase of 100% compared to that of NbCoSn. This work highlights the important roles that the dopant element and microstructure play in the thermoelectric properties of half-Heusler compounds.
Author(s)
Serrano-Sánchez, Federico
Luo, Ting
Yu, Junjie
Xie, Wenjie
Le, Congcong
Auffermann, Gudrun
Weidenkaff, Anke  orcid-logo
Zhu, Tiejun
Zhao, Xinbing
Alonso, José A.
Gault, Baptiste
Felser, Claudia
Fu, Chenguang
Journal
Journal of materials chemistry. A, Materials for energy and sustainability  
Open Access
DOI
10.1039/d0ta04644b
Language
English
IWKS  
Keyword(s)
  • annealing

  • chemical element

  • cobalt alloys

  • computational studies

  • crystal lattices

  • electric power factor

  • electronic structure

  • grain boundary

  • grain boundary scattering

  • Half-Heusler compound

  • hall mobility

  • high electrical power

  • hole mobility

  • iron alloys

  • lattice thermal conductivity

  • niobium alloy

  • platinum compounds

  • structural characterization

  • ternary alloy

  • thermal conductivity

  • thermoelectric equipment

  • thermo-electric materials

  • thermoelectric properties

  • thermoelectricity

  • tin alloys

  • Zircaloy

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