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oai:docta.ucm.es:20.500.14352/918442025-09-02T15:49:04Zcom_20.500.14352_14col_20.500.14352_15

Enhanced figure of merit in nanostructured (Bi,Sb)2Te3 with optimized composition, prepared by a straightforward arc-melting procedure Serrano Sánchez, Federico Gharsallah, Mouna Nemes, Norbert Marcel Biskup Zaja, Nevenko Varela Del Arco, María Martínez, José Luis Fernández Díaz, María Teresa Alonso, José Antonio 536 Termodinámica 2213 Termodinámica 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 (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. Ministerio de Economía, Comercio y Empresa (España) Depto. de Física de Materiales Fac. de Ciencias Físicas TRUE pub 2024-01-08T15:15:59Z 2024-01-08T15:15:59Z 2017 journal article VoR https://hdl.handle.net/20.500.14352/91844 XXXX-XXXX 10.1038/s41598-017-05428-4 2045-2322 eng info:eu-repo/grantAgreement/MINECO//MAT2013–41099-R info:eu-repo/grantAgreement/MINECO//MAT2015-66888-C3-3-R/ES/MAGNETISMO EN LA NANOESCALA: EXPLORANDO NUEVAS RUTAS (CRECIMIENTO Y CARACTERIZACION)/ Serrano-Sánchez, F., Gharsallah, M., Nemes, N.M. et al. Enhanced figure of merit in nanostructured (Bi,Sb)2Te3 with optimized composition, prepared by a straightforward arc-melting procedure. Sci Rep 7, 6277 (2017). https://doi.org/10.1038/s41598-017-05428-4 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ open access application/pdf Nature Research