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

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  • Nishiate Hirotaka
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • Ohta Michihiro
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • Yamamoto Atsushi
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • Obara Haruhiko
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • Lee Chul-Ho
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • Ueno Kazuo
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)

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抄録

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.

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