Thermal deformation effects on thermoelectric properties for Bi0.82Sb0.18alloys

Emmanuel Combe, Ryoji Funahashi, Tomonari Takeuchi, Tristan Barbier, Kunio Yubuta

研究成果: ジャーナルへの寄稿学術誌査読

2 被引用数 (Scopus)

抄録

Bi0.82Sb0.18alloy bulk materials have been prepared by mechanical alloying followed by a pulsed electric current sintering (PECS) technique. The sintered Bi0.82Sb0.18pellets were deformed in the direction perpendicular to applied pressure by a second PECS treatment. Significant decreases of both electrical resistivity and lattice part of the thermal conductivity have been obtained for the deformed alloys. Improved electrical transport properties in deformed Bi0.82Sb0.18alloys are attributed to the improvement of bulk density. On the other hand, the lattice part of thermal conductivity is decreased by the deforming treatment. Dislocations and twin domains are formed by the applied deformation. Furthermore the density of the defects is increased with increasing deformation temperature. The lower lattice thermal conductivity is observed in the higher density of defects, which can be one of the reasons for phonon scattering sites. The alloy prepared with deformation treatment at 493 K exhibits a thermoelectric figure of merit ZT of 0.31 at 200 K, improved by a factor about 1.5 by comparison with Bi0.82Sb0.18alloy prepared by a conventional single PECS heat treatment.

本文言語英語
ページ(範囲)563-568
ページ数6
ジャーナルJournal of Alloys and Compounds
692
DOI
出版ステータス出版済み - 2017
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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