Thermoelectric properties of W1−xNbxSe2−ySy polycrystalline compounds

Galina E. Yakovleva, Anatoly I. Romanenko, Alexandra Yu Ledneva, Viktor A. Belyavin, Vitalii A. Kuznetsov, Alexandr S. Berdinsky, Alexandr T. Burkov, Petr P. Konstantinov, Sergey V. Novikov, Mi Kyung Han, Sung Jin Kim, Vladimir E. Fedorov

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

We investigate the thermoelectric properties of bulk polycrystalline samples of WSe2-based compounds with partial substitutions in the cationic (W) and the anionic (Se) sublattices in the temperature range from 4.2 to 650 K. The substitution of W for Nb leads to a significant increase in the charge carrier concentration, however, deteriorates the charge carrier mobility. In contrast, the substitution of selenium for sulfur increases the charge carrier mobility, the thermal conductivity, and the Seebeck coefficient but conductivity changes non-monotonical. We show that the addition of sulfur in anionic sublattice affects the grain sizes in the polycrystalline material. Using substitutions in the anionic and cationic sublattices, we find the optimal ratio of the elements for better thermoelectric efficiency. The W0.98Nb0.02Se1.7S0.3 sample showed the best value of the figure of merit ZT = 0.26 (T = 650 K).

Original languageEnglish
Pages (from-to)6060-6067
Number of pages8
JournalJournal of the American Ceramic Society
Volume102
Issue number10
DOIs
StatePublished - 2019

Keywords

  • conductivity
  • layered crystal structures
  • polycrystalline materials
  • thermal conductivity
  • thermoelectric properties

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