Low-Thermal-Conductivity (MS)1+x(TiS2)2 (M = Pb, Bi, Sn) Misfit Layer Compounds for Bulk Thermoelectric Materials

Materials

Chunlei Wan¹  Yifeng Wang¹  Ning Wang¹ 

[1] Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan; E-Mails:

关键词: thermoelectric materials;    misfit layer compounds;    sound velocity;    interlayer bonding;   

DOI  :  10.3390/ma3042606

来源: mdpi

【 摘 要 】

A series of (MS)_1+x(TiS₂)₂ (M = Pb, Bi, Sn) misfit layer compounds are proposed as bulk thermoelectric materials. They are composed of alternating rock-salt-type MS layers and paired trigonal anti-prismatic TiS₂ layers with a van der Waals gap. This naturally modulated structure shows low lattice thermal conductivity close to or even lower than the predicted minimum thermal conductivity. Measurement of sound velocities shows that the ultra-low thermal conductivity partially originates from the softening of the transverse modes of lattice wave due to weak interlayer bonding. Combined with a high power factor, the misfit layer compounds show a relatively high ZT value of 0.28~0.37 at 700 K.

【 授权许可】

CC BY   
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