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Title

Enhanced figure of merit in nanostructured (Bi,Sb)2Te3 with optimized composition, prepared by a straightforward arc-melting procedure

AuthorsSerrano-Sánchez, F.; Gharsallah, M.; Nemes, N. M. ; Biskup, N. ; Varela, M.; Martínez, J. L. ; Fernández-Díaz, M. T.; Alonso, J. A.
Issue Date24-Jul-2017
PublisherSpringer Nature
CitationScientific Reports 7: 6277 (2017)
AbstractSb-doped BiTe 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: BiSbTe. We provide a detailed structural analysis of the BiSbTe series (0 ≤ x ≤ 2) 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.
Publisher version (URL)https://doi.org/10.1038/s41598-017-05428-4
URIhttp://hdl.handle.net/10261/189404
Identifiersdoi: 10.1038/s41598-017-05428-4
e-issn: 2045-2322
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