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Journal of Structural Chemistry

, Volume 58, Issue 5, pp 893–900 | Cite as

Electron transport properties of thermoelectrics based on layered substituted transition metal dichalcogenides

  • A. I. RomanenkoEmail author
  • G. E. Yakovleva
  • V. E. Fedorov
  • A. Yu. Ledneva
  • V. A. Kuznetsov
  • A. V. Sotnikov
  • A. R. Tsygankova
  • B. M. Kuchumov
Article

Abstract

Temperature dependences of the electrical conductivity are studied in the range 4.2’300 K and Seebeck coefficient at room temperature of bulk samples of tungsten dichalcogenide polycrystals with niobium substitutions for tungsten and selenium substitutions for sulfur – W1–x Nb x (S1–y Se y )2. The two-dimensionalization of electron transport properties is detected at niobium concentrations x ≥ 0.1 in W1–x Nb x S2 and x ≥ 0.05 in W1–x Nb x Se2. In samples with additional partial selenium substitution for sulfur the electron transport remains three-dimensional. At room temperature the Seebeck coefficient (at equal electrical conductivities) is several times higher in the samples with quasi-two-dimensional transport than in the samples with three-dimensional transport. The calculation of the power factor at room temperature shows its nine times increase.

Keywords

layered transition metal chalcogenides electrical conductivity Seebeck coefficient 

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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  • A. I. Romanenko
    • 1
    • 2
    Email author
  • G. E. Yakovleva
    • 1
  • V. E. Fedorov
    • 1
    • 3
  • A. Yu. Ledneva
    • 1
  • V. A. Kuznetsov
    • 1
  • A. V. Sotnikov
    • 1
  • A. R. Tsygankova
    • 1
    • 3
  • B. M. Kuchumov
    • 1
  1. 1.Nikolaev Institute of Inorganic Chemistry, Siberian BranchRussian Academy of SciencesNovosibirskRussia
  2. 2.Tomsk National Research State UniversityTomskRussia
  3. 3.Novosibirsk National Research State UniversityNovosibirskRussia

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