Preparation and Thermoelectric Properties of Chevrel-Phase Cu<I><SUB>x</SUB></I>Mo<SUB>6</SUB>S<SUB>8</SUB> (2.0≤<I>x</I>≤4.0)

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  • Ohta Michihiro
    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)
  • Yamamoto Atsushi
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)

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Other Title
  • Preparation and thermoelectric properties of Chevrel-phase Cu[x]Mo6S8 (2.0 [less-than or equal to] x [less-than or equal to] 4.0)
  • Preparation and Thermoelectric Properties of Chevrel-Phase Cu<I><SUB>x</SUB></I>Mo<SUB>6</SUB>S<SUB>8</SUB> (2.0&le;<I>x</I>&le;4.0)

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Abstract

Chevrel-phase sulfides CuxMo6S8, where 2.0≤x≤4.0, were prepared by reacting appropriate amounts of Cu, Mo, and MoS2 powders at 1273–1523 K for 8 h in vacuum. The samples were then densified by pressure-assisted sintering at 1223–1473 K for 1 h at a pressure of 30 MPa in vacuum. The density of all the sintered samples was greater than 95% of the theoretical density. X-ray analysis showed that all the sintered samples consisted entirely of the hexagonal Chevrel phase. The value of the lattice parameters a and c increased with the Cu content. Measurement of the Seebeck coefficient, electrical resistivity, and thermal conductivity was carried out on single-phase sintered CuxMo6S8 samples in the temperature range of 300–950 K. All the sintered samples had a positive Seebeck coefficient. Further, the thermoelectric properties improved when the Cu content was increased. With an increase in the Cu content, the Seebeck coefficient and electrical resistivity increased, while the thermal conductivity decreased. The highest dimensionless thermoelectric figure of merit ZT (0.4) was observed in Cu4.0Mo6S8 at 950 K.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 50 (9), 2129-2133, 2009

    The Japan Institute of Metals and Materials

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