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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.52  No.8 (2011)  >  pp.1535-1538

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Preparation of Single-Phase Pb-Filled Chevrel-Phase Sulfide and Its Thermoelectric Properties

Hirotaka Nishiate1), Michihiro Ohta1), Atsushi Yamamoto1), Haruhiko Obara1), Chul-Ho Lee1) and Kazuo Ueno1)
1) Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)

Pb-filled Chevrel-phase sulfides PbMo6S8−y were prepared from PbS, Mo, and MoS2. The single phase was formed in the nominal composition PbMo6S7.8 (8−y=7.8). While the secondary PbS and Mo phases were formed in sulfur-poor compositions, the secondary MoS2 phase was formed in sulfur-rich compositions. The sintered sample had a positive Seebeck coefficient. The Seebeck coefficient and electrical resistivity increased with temperature. Furthermore, the thermal conductivity was dominated by the electronic thermal conductivity, and the complex crystal structure yielded a low lattice thermal conductivity. The thermoelectric figure of merit ZT increased with temperature, reaching a value of 0.08 at 850 K.

thermoelectric materials, single phase, Chevrel-phase sulfides, lead filling, pressure-assisted sintering, thermoelectric properties

Received: November 20, 2010
Accepted: March 31, 2011 , Published online: July 25, 2011
Copyright (c) 2011 The Thermoelectrics Society of Japan



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