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

✍ Scribed by Paz Vaqueiro; Gerard G. Sobany; A.V. Powell; Kevin S. Knight

• Book ID: 104029592
• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 290 KB
• Volume: 179
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2006.04.004

✦ Synopsis

The skutterudite-related material CoGe 1.5 Te 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 1.5 Te 1.5 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 3, a ¼ 12.3270( 5) and c ¼ 15.102(1) A ˚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 CoGe 1.5 Te 1.5 is an n-type semiconductor.