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Título: | Nanostructured Bi2Te3 prepared by a straightforward arc-melting method |
Autor: | Gharsallah, M.; Serrano-Sánchez, F.; Bermúdez, J.; Nemes, N. M. CSIC ORCID CVN; Martínez, J. L. CSIC ORCID ; Elhalouani, F.; Alonso, J. A. CSIC ORCID | Palabras clave: | Nanostructuration Thermopower Neutron powder diffraction ZT figure of merit Thermoelectrics Lattice thermal conductivity |
Fecha de publicación: | 15-mar-2016 | Editor: | Springer Nature | Citación: | Nanoscale Research Letters 11: 142 (2016) | Resumen: | Thermoelectric materials constitute an alternative source of sustainable energy, harvested from waste heat. BiTe is the most utilized thermoelectric alloy. We show that it can be readily prepared in nanostructured form by arc-melting synthesis, yielding mechanically robust pellets of highly oriented polycrystals. This material has been characterized by neutron powder diffraction (NPD), scanning electron microscopy (SEM), and electronic and thermal transport measurements. A microscopic analysis from NPD data demonstrates a near-perfect stoichiometry of BiTe and a fair amount of anharmonicity of the chemical bonds. The as-grown material presents a metallic behavior, showing a record-low resistivity at 320 K of 2 μΩ m, which is advantageous for its performance as a thermoelectric material. SEM analysis shows a stacking of nanosized sheets, each of them presumably single-crystalline, with large surfaces perpendicular to the c crystallographic axis. This nanostructuration notably affects the thermoelectric properties, involving many surface boundaries that are responsible for large phonon scattering factors, yielding a thermal conductivity as low as 1.2 W m K around room temperature. | Versión del editor: | https://doi.org/10.1186/s11671-016-1345-5 | URI: | http://hdl.handle.net/10261/186645 | DOI: | 10.1186/s11671-016-1345-5 | Identificadores: | doi: 10.1186/s11671-016-1345-5 e-issn: 1556-276X issn: 1931-7573 |
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