Structure and thermoelectric properties of the ordered skutterudite CoGe1.5Te1.5

Paz Vaqueiro, Gerard G. Sobany, A. V. Powell, Kevin S. Knight

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

The skutterudite-related material CoGe1.5Te1.5 has been synthesised and structurally characterised by powder neutron diffraction. Analysis of the high-resolution powder neutron diffraction data indicates that the structure of CoGe1.5Te1.5 retains the a+a+a+ tilt system of the ideal skutterudite structure, while the anions are ordered in layers perpendicular to the [111] direction of the skutterudite unit cell. This anion ordering results in a lowering of the symmetry from cubic to rhombohedral (space group R over(3, -), a=12.3270(5) and c=15.102(1) Å at 293 K). The electrical transport properties have been investigated using four-probe resistivity and Seebeck coefficient measurements. The temperature dependence of the electrical resistivity and the magnitude of the Seebeck coefficient indicate that CoGe1.5Te1.5 is an n-type semiconductor. © 2006 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)2047-2053
Number of pages7
JournalJournal of Solid State Chemistry
Volume179
Issue number7
DOIs
Publication statusPublished - Jul 2006

Keywords

  • Neutron diffraction
  • Skutterudite
  • Thermoelectric properties

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