Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 36, Issue 5, Pages 1183-1189Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2015.11.025
Keywords
Thermoelectric; Titanium disulfide; Mechanical alloying
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Funding
- European Commission [FP7-SME-2012-1, 315019]
- Engineering and Physical Sciences Research Council [EP/L014068/1] Funding Source: researchfish
- EPSRC [EP/L014068/1] Funding Source: UKRI
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Bulk polycrystalline samples in the series T1-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. (C) 2015 Elsevier Ltd. All rights reserved.
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