Preparation and thermoelectric properties of misfit-layered sulfide [Yb1.90S2]0.62NbS2

Yuzuru Miyazaki, Hidenori Ogawa, Tsuyoshi Kajitani

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18 Citations (Scopus)

Abstract

We have prepared polycrystalline samples of Yb-Nb-S-based misfit-layered compound and measured their thermoelectric properties below 300 K. The compound consists of an alternate stacking of a trigonal prism (MoS2)-type [NbS2] layer and a two-layered rock-salt-type [Yb 1.90S2] slab, being incommensurate parallel to the a-axis. Approximately 5% Yb deficiency is necessary to obtain single-phase samples. Metallic conductivity accompanied by a large Seebeck coefficient S has been observed down to 4.2 K for the single-phase samples. At 300K, the sample exhibits S = 60 μV·K-1 and resistivity of p = 1.4mΩ·cm, with thermal conductivity of κ = 0.80 W·K-1·m-1. The resulting figure-of-merit (Z = S2/ρκ) becomes 3.2 × 10-4 K-1 at 300K, yielding the dimensionless figure-of-merit of ZT ∼ 0.1.

Original languageEnglish
Pages (from-to)L1202-L1204
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume43
Issue number9 AB
DOIs
Publication statusPublished - 2004 Sep 15

Keywords

  • Figure-of-merit
  • Hall effect
  • Misfit layer
  • Thermoelectric compound
  • Ytterbium niobium sulfides

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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