Structural characterization and thermoelectric properties of Br-Doped AgSnm[Sb0.8Bi0.2]Te2+m Systems

Delgado, Daniela; Moris-López, Silvana; Valencia-Gálvez, P.; López, María Luisa; Álvarez-Serrano, Inmaculada; Blake, Graeme R.; Galdámez, Antonio

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dc.contributor.author	Delgado, Daniela
dc.contributor.author	Moris-López, Silvana
dc.contributor.author	Valencia-Gálvez, P.
dc.contributor.author	López, María Luisa
dc.contributor.author	Álvarez-Serrano, Inmaculada
dc.contributor.author	Blake, Graeme R.
dc.contributor.author	Galdámez, Antonio
dc.date.accessioned	2023-09-11T18:48:22Z
dc.date.available	2023-09-11T18:48:22Z
dc.date.issued	2023
dc.identifier.uri	http://repositorio.ucm.cl/handle/ucm/4973
dc.description.abstract	Herein, we report the synthesis, structural and microstructural characterization, and thermoelectric properties of AgSnm[Sb0.8Bi0.2]Te2+m and Br-doped telluride systems. These compounds were prepared by solid-state reaction at high temperature. Powder X-ray diffraction data reveal that these samples exhibit crystal structures related to the NaCl-type lattice. The microstructures and morphologies are investigated by scanning electron microscopy, energy-dispersive X-ray spectroscopy (EDS), and high-resolution transmission electron microscopy (HRTEM). Positive values of the Seebeck coefficient (S) indicate that the transport properties are dominated by holes. The S of undoped AgSnm[Sb0.8Bi0.2]Te2+m ranges from +40 to 57 μV·K−1. Br-doped samples with m = 2 show S values of +74 μV·K−1 at RT, and the Seebeck coefficient increases almost linearly with increasing temperature. The total thermal conductivity (κtot) monotonically increases with increasing temperature (10–300 K). The κtot values of undoped AgSnm[Sb0.8Bi0.2]Te2+m are ~1.8 W m−1 K−1 (m = 4) and ~1.0 W m−1 K−1 (m = 2) at 300 K. The electrical conductivity (σ) decreases almost linearly with increasing temperature, indicating metal-like behavior. The ZT value increases as a function of temperature. A maximum ZT value of ~0.07 is achieved at room temperature for the Br-doped phase with m = 4.	es_CL
dc.language.iso	en	es_CL
dc.rights	Atribución-NoComercial-SinDerivadas 3.0 Chile	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/cl/	*
dc.source	Materials, 16(15), 5213	es_CL
dc.subject	Tellurides	es_CL
dc.subject	Seebeck coefficient	es_CL
dc.subject	Thermal conductivity	es_CL
dc.subject	Lead-free thermoelectric materials	es_CL
dc.title	Structural characterization and thermoelectric properties of Br-Doped AgSnm[Sb0.8Bi0.2]Te2+m Systems	es_CL
dc.type	Article	es_CL
dc.ucm.indexacion	Scopus	es_CL
dc.ucm.indexacion	Isi	es_CL
dc.ucm.uri	mdpi.com/1996-1944/16/15/5213	es_CL
dc.ucm.doi	doi.org/10.3390/ma16155213	es_CL