Crystal structure and thermoelectric properties of misfit-layered sulfides [Ln2S2]p NbS2 (Ln = lanthanides)

Yuzuru Miyazaki, Hidenori Ogawa, Takaki Nakajo, Yuta Kikuchii, Kei Hayashi

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Polycrystalline samples of misfit-layered sulfides [Ln2S 2]p NbS2 (Ln = lanthanides) have been prepared using the CS2 sulfidation method. Except for Ln = Eu and Lu, single-phase samples were prepared. The compounds consist of an alternate stacking of a trigonal prism-type [NbS2] layer and a double-layered NaCl [rock salt (RS)]-type [Ln2S2] block, parallel to the c-axis. Three types of stacking modes of the [NbS2] layer and the RS-type block have been confirmed with a (3 + 1)-dimensional superspace group description: two face-centered orthorhombic structures and one face-centered monoclinic structure. Slightly cation-deficient samples with Ln = Yb exhibit the highest Seebeck coefficient S ≈ 59 μV/K. With electrical resistivity of ρ = 1.4 m Ω cm and thermal conductivity of κ = 0.69 W/Km, this yields a dimensionless figure of merit of ZT = 0.11 at 300 K.

Original languageEnglish
Pages (from-to)1335-1339
Number of pages5
JournalJournal of Electronic Materials
Volume42
Issue number7
DOIs
Publication statusPublished - 2013 Jul

Keywords

  • Misfit-layered sulfides
  • structure modulation
  • superspace group
  • thermoelectric properties

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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