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

Paz Vaqueiro; Gerard G. Sobany; Martin Stindl

doi:10.1016/j.jssc.2008.01.025

Structure and electrical transport properties of the ordered skutterudites MGe_1.5S_1.5 (M=Co, Rh, Ir)

Paz Vaqueiro, Gerard G. Sobany, Martin Stindl

School of Engineering & Physical Sciences

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

Abstract

High-resolution powder neutron diffraction data collected for the skutterudites MGe_1.5S_1.5 (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 CoGe_1.5S_1.5 has been investigated. While doping of CoGe_1.5S_1.5 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 language	English
Pages (from-to)	768-776
Number of pages	9
Journal	Journal of Solid State Chemistry
Volume	181
Issue number	4
DOIs	https://doi.org/10.1016/j.jssc.2008.01.025
Publication status	Published - Apr 2008

Keywords

Neutron diffraction
Ternary skutterudite
Thermoelectric properties

Access to Document

10.1016/j.jssc.2008.01.025

Cite this

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

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. {\textcopyright} 2008.",

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TY - JOUR

T1 - Structure and electrical transport properties of the ordered skutterudites MGe1.5S1.5 (M=Co, Rh, Ir)

AU - Vaqueiro, Paz

AU - Sobany, Gerard G.

AU - Stindl, Martin

PY - 2008/4

Y1 - 2008/4

N2 - 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.

AB - 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.

KW - Neutron diffraction

KW - Ternary skutterudite

KW - Thermoelectric properties

U2 - 10.1016/j.jssc.2008.01.025

DO - 10.1016/j.jssc.2008.01.025

M3 - Article

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JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

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