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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 3    June 2009

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Thermoelectric properties of MxMo6Te8 (M=Ag, Cu­)
SHI Xiao-ya(史啸亚)1, 2, WANG Li(王 丽)1, 2, CHEN Li-dong(陈立东)1, CHEN Xi-hong(陈喜红)1

1. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics,
Chinese Academy of Sciences, Shanghai 200050, China;
2. Graduate University of the Chinese Academy of Sciences, Beijing 100080, China

Abstract:Ag and Cu filled Chevrel phase MxMo6Te8 (x=1.0, 2.0) samples were synthesized by direct solid state reaction and spark plasma sintering. The electrical and thermal properties were investigated in the temperature range of 300−800 K. The results show that both the electrical and thermal properties are affected by filler atoms. Although the electrical conductivity of MxMo6Te8 is slightly higher than that of state-of-the-art thermoelectric material, such as filled skutterudites, the absolute value of Seebeck coefficient is relatively low. Due to the phonon scattering by the filler atoms, the decrease of the thermal conductivity and the lattice thermal conductivity is obvious. As a result, the dimensionless figure of merit(ZT) is improved over the whole temperature region. The highest ZT value is 0.034 at 800 K for the AgMo6Te8 sample.

 

Key words: thermoelectric property; Chevrel phase; chalcogenide

ISSN 1672-7029
CN 43-1423/U

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