Electron doping and phonon scattering in Ti1+xS2 thermoelectric compounds

Beaumale, M., Barbier, T., Breard, Y., Guelou, G., Powell, A. V., Vaqueiro, P. ORCID: https://orcid.org/0000-0001-7545-6262 and Guilmeau, E. (2014) Electron doping and phonon scattering in Ti1+xS2 thermoelectric compounds. Acta Materialia, 78. pp. 86-92. ISSN 1359-6454 doi: 10.1016/j.actamat.2014.06.032

Abstract/Summary

Bulk polycrystalline samples in the series Ti1+xS2 (x = 0 to 0.05) were prepared using high temperature synthesis from the elements and spark plasma sintering. X-ray structure analysis shows that the lattice constant c expands as titanium intercalates between TiS2 slabs. For x=0, a Seebeck coefficient close to -300 μV/K is observed for the first time in TiS2 compounds. The decrease in electrical resistivity and Seebeck coefficient that occurs upon Ti intercalation (Ti off stoichiometry) supports the view that charge carrier transfer to the Ti 3d band takes place and the carrier concentration increases. At the same time, the thermal conductivity is reduced by phonon scattering due to structural disorder induced by Ti intercalation. Optimum ZT values of 0.14 and 0.48 at 300K and 700K, respectively, are obtained for x=0.025.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/37394
Item Type	Article
Refereed	Yes
Divisions	Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry Interdisciplinary centres and themes > Energy Research
Uncontrolled Keywords	energy; thermoelectric materials
Publisher	Elsevier
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