Reducing Lattice Thermal Conductivity of MnTe by Se Alloying toward High Thermoelectric Performance

Jinfeng Dong, Fu Hua Sun, Huaichao Tang, Kei Hayashi, Hezhang Li, Peng Peng Shang, Yuzuru Miyazaki, Jing Feng Li

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Lead-free manganese telluride has been considered to be a promising candidate for mid-temperature thermoelectric materials. In this work, we report point defect scattering-induced reduction of thermal conductivity in MnTe with Se alloying, fabricated by a facile method combining mechanical alloying and spark plasma sintering. A low lattice thermal conductivity of 0.56 W/mK was obtained for MnTe0.92Se0.08, which is quite close to the amorphous limits. A detailed Debye model analysis reveals the underlying mechanism of phonon scattering and well predicts the thermal conductivity with different contents of Se. Meanwhile, a slight increase of carrier concentration was also observed after Se alloying, accompanied by a variation of energy gap that may be associated with the competition among anions in trapping charges. Further Na doping leads to enhanced electrical transport properties, achieving a maximum ZT value of 1.03 at 873 K. An average ZT of 0.52 and a calculated efficiency of more than 9% also suggest the promising application of MnTe at medium temperatures.

Original languageEnglish
Pages (from-to)28221-28227
Number of pages7
JournalACS Applied Materials and Interfaces
Volume11
Issue number31
DOIs
Publication statusPublished - 2019 Aug 7

Keywords

  • Debye model
  • Se alloying
  • manganese telluride
  • thermal conductivity
  • thermoelectric

ASJC Scopus subject areas

  • Materials Science(all)

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