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oai:docta.ucm.es:20.500.14352/1035232025-09-01T17:50:41Zcom_20.500.14352_14col_20.500.14352_15

Delgado, Daniela Moris, Silvana Valencia Gálvez, Paulina López García, María Luisa Álvarez Serrano, Inmaculada Blake, Graeme R. Galdámez, Antonio 2024-04-25T15:57:24Z 2024-04-25T15:57:24Z 2023 Delgado, D.; Moris, S.; Valencia-Gálvez, P.; López, M.L.; Álvarez-Serrano, I.; Blake, G.R.; Galdámez, A. Structural Characterization and Thermoelectric Properties of Br-Doped AgSnm[Sb0.8Bi0.2]Te2+m Systems. Materials 2023, 16, 5213. https://doi.org/10.3390/ma16155213 10.3390/ma16155213 https://hdl.handle.net/20.500.14352/103523 1996-1944 https://doi.org/10.3390/ma16155213 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 mu V.K-1. Br-doped samples with m = 2 show S values of +74 mu V.K-1 at RT, and the Seebeck coefficient increases almost linearly with increasing temperature. The total thermal conductivity (kappa(tot)) monotonically increases with increasing temperature (10-300 K). The ktot values of undoped AgSnm[Sb0.8Bi0.2]Te2+m are similar to 1.8 W m(-1) K-1 (m = 4) and similar to 1.0 W m(-1) K-1 (m = 2) at 300 K. The electrical conductivity (sigma) decreases almost linearly with increasing temperature, indicating metal-like behavior. The ZT value increases as a function of temperature. A maximum ZT value of similar to 0.07 is achieved at room temperature for the Br-doped phase with m = 4. eng http://creativecommons.org/licenses/by/4.0/ open access Attribution 4.0 International Structural Characterization and Thermoelectric Properties of Br-Doped AgSnm[Sb0.8Bi0.2]Te2+m Systems journal article