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Thermoelectric properties of TiS2 mechanically alloyed compounds

Bourges, C., Barbier, T., Guelou, G., Vaqueiro, P., Powell, A. V., Lebedev, O. I., Barrier, N., Kinemuchi, Y. and Guilmeau, E. (2015) Thermoelectric properties of TiS2 mechanically alloyed compounds. Journal of the European Ceramic Society, 36 (5). pp. 1183-1189. ISSN 1873-619X

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To link to this item DOI: 10.1016/j.jeurceramsoc.2015.11.025

Abstract/Summary

Bulk polycrystalline samples in the series Ti1−xNbxS2 (0 ≤ x ≤ 0.075) were prepared using mechanical alloying synthesis and spark plasma sintering. X-ray diffraction analysis coupled with high resolution transmission electron microscopy indicates the formation of trigonal TiS2 by high energy ball-milling. The as-synthesized particles consist of pseudo-ordered TiS2 domains of around 20–50 nm, joined by bent atomic planes. This bottom-up approach leads, after spark plasma sintering, to homogeneous solid solutions, with a niobium solubility limit of x = 0.075. Microstructural observations evidence the formation of small crystallites in the bulk compounds with a high density of stacking faults. The large grain boundary concentration coupled with the presence of planar defects, leads to a substantial decrease in the thermal conductivity to 1.8 W/mK at 700 K. This enables the figure of merit to reach ZT = 0.3 at 700 K for x = 0.05, despite the lower electron mobility in mechanically alloyed samples due to small crystallite/grain size and structural defects.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
Interdisciplinary centres and themes > Energy Research
Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) > Xray (CAF)
Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) > Electron Microscopy Laboratory (CAF)
ID Code:48100
Publisher:Elsevier

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