Structure and electrical transport properties of the ordered skutterudites MGe{sub 1.5}S{sub 1.5} (M=Co, Rh, Ir)
- Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom)
High-resolution powder neutron diffraction data collected for the skutterudites MGe{sub 1.5}S{sub 1.5} (M=Co, Rh, Ir) reveal that these materials adopt an ordered skutterudite structure (space group R3-bar ), 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 Ge{sub 2}S{sub 2}, 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{sub 1.5}S{sub 1.5} has been investigated. While doping of CoGe{sub 1.5}S{sub 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. - Graphical abstract: The MGe{sub 1.5}S{sub 1.5} phases exhibit an ordered skutterudite structure, in which the anions form diamond-like four-membered Ge{sub 2}S{sub 2} rings.
- OSTI ID:
- 21128245
- Journal Information:
- Journal of Solid State Chemistry, Vol. 181, Issue 4; Other Information: DOI: 10.1016/j.jssc.2008.01.025; PII: S0022-4596(08)00041-8; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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