2026-06-26T20:17:45Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/732322023-08-26T15:14:52Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Gainza, Javier
author
Serrano Sánchez, Federico
author
Rodrigues, Joao Elias F. S.
author
Dura, Óscar J.
author
Fragoso, Brenda
author
Ferrer, Mateus M.
author
Nemes, Norbert Marcel
author
Martínez, José Luis
author
Fernández Díaz, María T.
author
Alonso, José Antonio
2023-06-22T12:49:55Z
2023-06-22T12:49:55Z
2023-01
2073-4352
10.3390/cryst13010049
https://hdl.handle.net/20.500.14352/73232
http://dx.doi.org/10.3390/cryst13010049
https://www.mdpi.com/
Among chalcogenide thermoelectric materials, SnTe is an excellent candidate for intermediate temperature applications, in replacement of toxic PbTe. We have prepared pure polycrystalline SnTe by arc melting, and investigated the structural evolution by temperature-dependent neutron powder diffraction (NPD) from room temperature up to 973 K. In this temperature range, the sample is cubic (space group Fm-3m) and shows considerably larger displacement parameters for Te than for Sn. The structural analysis allowed the determination of the Debye model parameters and provided information on the Sn-Te chemical bonds. SEM images show a conspicuous nanostructuration in layers below 30 nm thick, which contributes to the reduction of the thermal conductivity down to 2.5 W/m center dot K at 800 K. The SPS treatment seems to reduce the number of Sn vacancies, thus diminishing the carrier density and increasing the Seebeck coefficient, which reaches 60 mu V K^(-1) at 700 K, as well as the weighted mobility, almost doubled compared with that of the as-grown sample.
eng
Atribución 3.0 España
Structural evolution from neutron powder diffraction of nanostructured snte obtained by arc melting
journal article
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Nemes 01 OA+CC.pdf
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Nemes 01 OA+CC.pdf.txt