Article (Scientific journals)
CdI2 structure type as potential thermoelectric materials: Synthesis and high temperature thermoelectric properties of the solid solution TiSxSe2−x
Franck, Gascoin; Nunna, Raghavendra; Emmanuel, Guilmeau et al.
2012In Journal of Alloys and Compounds, 521, p. 121-125
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Keywords :
Thermoelectric; Titanium sulfide; Solid solution
Abstract :
[en] Polycrystalline samples of the solid solution TiSxSe2−x with x varying from 0 to 2 were prepared using direct high temperature reaction of stoichiometric amounts of the elements. Rietveld refinements of powder X-ray diffraction data are consistent with the existence of a full solid solution. High temperature Seebeck coefficient, electrical resistivity and thermal diffusivity measurements were performed on pellets densified by spark plasma sintering. These measurements reveal that along the solid solution the transport properties vary from the rather metallic and p-type character of TiSe2 to the semiconducting and n-type of TiS2. This change of conduction regime is responsible for the peculiar evolutions of transport properties of TiS0.5Se1.5 with increasing temperature that vary somewhat differently than that of the other members of the solid solution. As expected, the disorder generated by the mixed occupancy of the S and Se on the anionic site is responsible for the diminution of the lattice thermal conductivity. A maximum zT above 0.4 at 400 °C is reached for TiS1.5Se0.5.
Disciplines :
Chemistry
Author, co-author :
Franck, Gascoin
Nunna, Raghavendra ;  Université de Liège - ULiège > Form. doct. sc. (chimie - Bologne)
Emmanuel, Guilmeau
Yohann, Bréard
Language :
English
Title :
CdI2 structure type as potential thermoelectric materials: Synthesis and high temperature thermoelectric properties of the solid solution TiSxSe2−x
Publication date :
25 April 2012
Journal title :
Journal of Alloys and Compounds
ISSN :
0925-8388
eISSN :
1873-4669
Publisher :
Elsevier Science, Lausanne, Switzerland
Volume :
521
Pages :
121-125
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 13 June 2013

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