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Investigation of the sintering pressure and thermal conductivity anisotropy of melt-spun spark-plasma-sintered (Bi,Sb)2Te3 thermoelectric materials

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Abstract

A combined melt-spinning and spark-plasma-sintering (SPS) procedure has proven to be effective in preparing high-performance (Bi,Sb)2Te3 thermoelectric (TE) nanocomposites via creating and optimizing their resulting multiscale microstructures. (Bi,Sb)2Te3 possesses a highly anisotropic crystal structure; therefore, it is important to investigate any potential correlation between the SPS conditions, the as-formed microstructures, and the resulting TE properties. In this work, we investigate the correlation between the SPS pressure, the microstructure texture, and the anisotropy of the total thermal conductivity in these melt-spun spark-plasma-sintered (Bi,Sb)2Te3 compounds. The thermal conductivity has been measured in directions that are both perpendicular and parallel to the pressing (or force) direction by rearranging the sample geometry as described in the text. The results show that the anisotropy of thermal conductivity is ∼0, 2–3, 6–7, and 13–15% for the samples sintered at pressures of 20, 30, 45, and 60 MPa, respectively. These results are consistent with an increasing degree of orientation observed by x-ray diffraction and electron microscopy.

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ACKNOWLEDGMENTS

We thank the support received from the National Basic Research Program of China (Grant No. 2007CB607501) and the Natural Science Foundation of China (Grant Nos. 50731006 and 50672118), along with 111 Project (Grant No. B07040). The work at Clemson University was supported by DOE/EPSCoR Implementation Grant (DE-FG02-04ER-46139) and the SC EPSCoR cost sharing program. W. Xie would also like to thank the China Scholarship Council (CSC) for support in the form of a partial fellowship (No. 2008695022).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China

    Wenjie Xie, Shanyu Wang, Xinfeng Tang & Qingjie Zhang

  2. Department of Physics and Astronomy, Clemson University, Clemson, South Carolina, 29634-0978, USA

    Wenjie Xie, Jian He, Song Zhu, Tim Holgate & Terry M. Tritt

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  1. Wenjie Xie
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  2. Jian He
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  3. Song Zhu
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  4. Tim Holgate
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  6. Xinfeng Tang
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  7. Qingjie Zhang
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  8. Terry M. Tritt
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Correspondence to Xinfeng Tang.

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Xie, W., He, J., Zhu, S. et al. Investigation of the sintering pressure and thermal conductivity anisotropy of melt-spun spark-plasma-sintered (Bi,Sb)2Te3 thermoelectric materials. Journal of Materials Research 26, 1791–1799 (2011). https://doi.org/10.1557/jmr.2011.170

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