Structure and thermoelectric properties of the ordered skutterudite CoGe{sub 1.5}Te{sub 1.5}

Journal Article · Sat Jul 15 00:00:00 EDT 2006 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2006.04.004· OSTI ID:20905348

Vaqueiro, Paz ^[1]; Sobany, Gerard G ^[1]; Powell, A V ^[1]; Knight, Kevin S ^[2]

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1. Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom)
2. ISIS Facility, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX (United Kingdom)

The skutterudite-related material CoGe{sub 1.5}Te{sub 1.5} has been synthesised and structurally characterised by powder neutron diffraction. Analysis of the high-resolution powder neutron diffraction data indicates that the structure of CoGe{sub 1.5}Te{sub 1.5} retains the a{sup +}a{sup +}a{sup +} 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 R3-bar , a=12.3270(5) and c=15.102(1)A at 293K). 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 CoGe{sub 1.5}Te{sub 1.5} is an n-type semiconductor.

• OSTI ID: 20905348
• Journal Information: Journal of Solid State Chemistry, Vol. 179, Issue 7; Other Information: DOI: 10.1016/j.jssc.2006.04.004; PII: S0022-4596(06)00206-4; Copyright (c) 2006 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

Related Subjects

36 MATERIALS SCIENCE
CHARGED-PARTICLE TRANSPORT
ELECTRIC CONDUCTIVITY
LAYERS
NEUTRON DIFFRACTION
SEMICONDUCTOR MATERIALS
SPACE GROUPS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
THERMOELECTRIC PROPERTIES
TRIGONAL LATTICES