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arXiv:1803.07327 (cond-mat)
[Submitted on 20 Mar 2018]

Title:Enhanced figure of merit in nanostructured (Bi, Sb) 2 Te 3 with optimized composition, prepared by a straightforward arc-melting procedure

Authors:F Serrano-Sánchez, M Gharsallah, NM Nemes, N Biskup, M Varela, JL Martínez, MT Fernández-Díaz, JA Alonso
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Abstract:Sb-doped Bi2Te3 is known since the 1950s as the best thermoelectric material for near-room temperature operation. Improvements in material performance are expected from nanostructuring procedures. We present a straightforward and fast method to synthesize already nanostructured pellets that show an enhanced ZT due to a remarkably low thermal conductivity and unusually high Seebeck coefficient for a nominal composition optimized for arc-melting: Bi0.35Sb1.65Te3. We provide a detailed structural analysis of the Bi2-xSbxTe3 series based on neutron powder diffraction as a function of composition and temperature that reveals the important role played by atomic vibrations. Arc-melting produces layered platelets with less than 50 nm-thick sheets. The low thermal conductivity is attributed to the phonon scattering at the grain boundaries of the nanosheets. This is a fast and cost-effective production method of highly efficient thermoelectric materials.
Subjects: Materials Science (cond-mat.mtrl-sci)
Cite as: arXiv:1803.07327 [cond-mat.mtrl-sci]
  (or arXiv:1803.07327v1 [cond-mat.mtrl-sci] for this version)
  https://doi.org/10.48550/arXiv.1803.07327
Journal reference: 2017/7/24 Scientific Reports Volume 7 Issue 1 Pages 6277 Publisher Nature Publishing Group
Related DOI: https://doi.org/10.1038/s41598-017-05428-4

Submission history

From: Norbert Nemes [view email]
[v1] Tue, 20 Mar 2018 09:39:10 UTC (1,069 KB)
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