Structure and electrical transport properties of the ordered skutterudites MGe1.5S1.5 (M=Co, Rh, Ir)

Paz Vaqueiro, Gerard G. Sobany, Martin Stindl

Research output: Contribution to journalArticle

Abstract

High-resolution powder neutron diffraction data collected for the skutterudites MGe1.5S1.5 (M=Co, Rh, Ir) reveal that these materials adopt an ordered skutterudite structure (space group R3¯), in which the anions are ordered in layers perpendicular to the [111] direction. In this ordered structure, the anions form two-crystallographically distinct four-membered rings, with stoichiometry Ge2S2, in which the Ge and S atoms are trans to each other. The transport properties of these materials, which are p-type semiconductors, are discussed in the light of the structural results. The effect of iron substitution in CoGe1.5S1.5 has been investigated. While doping of CoGe1.5S1.5 has a marked effect on both the electrical resistivity and the Seebeck coefficient, these ternary skutterudites exhibit significantly higher electrical resistivities than their binary counterparts. © 2008.

Original languageEnglish
Pages (from-to)768-776
Number of pages9
JournalJournal of Solid State Chemistry
Volume181
Issue number4
DOIs
Publication statusPublished - Apr 2008

Keywords

  • Neutron diffraction
  • Ternary skutterudite
  • Thermoelectric properties

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