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Thermoelectric properties of TiS2 mechanically alloyed compounds

Abstract : 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. © 2015 Elsevier Ltd.
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C. Bourgès, T. Barbier, G. Guélou, P. Vaqueiro, A.V. Powell, et al.. Thermoelectric properties of TiS2 mechanically alloyed compounds. Journal of the European Ceramic Society, 2016, 36 (5), pp.1183-1189. ⟨10.1016/j.jeurceramsoc.2015.11.025⟩. ⟨hal-02184700⟩



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