1. Synthesis and characterization of bismuth telluride-based thermoelectric nanocomposites containing MoS2 nano-inclusions.
- Author
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Keshavarz, Mohsen K., Vasilevskiy, Dimitri, Masut, Remo A., and Turenne, Sylvain
- Subjects
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SYNTHESIS of Nanocomposite materials , *BISMUTH telluride , *THERMOELECTRIC materials , *MOLYBDENUM sulfides , *METAL inclusions , *MECHANICAL alloying - Abstract
Bulk nanocomposites of (Bi0.2Sb0.8)2Te3 and (Bi0.95Sb0.05)2(Te0.95Se0.05)3 containing MoS2 nano-inclusions were obtained by mechanical alloying and hot extrusion. The nano-inclusions are observed to decorate the grain boundaries of the matrix, leading to a significant reduction of average grain size and crystallite size compared to those of the conventional single phase alloy. Consequently, the thermal conductivity of these nanocomposites also decreases (~1.4W/m·K at 450K for 0.4wt.% MoS2) when compared to the conventional alloy (~1.8W/m·K). The structural changes in the nanocomposites obtained by mechanical spectroscopy in the temperature range 293-540K show an increase of the internal friction accompanied by a systematic reduction of its activation energy with an increase in MoS2 content. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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