RT Journal Article
T1 Structural Characterization and Thermoelectric Properties of Br-Doped AgSnm[Sb0.8Bi0.2]Te2+m Systems
A1 Delgado, Daniela
A1 Moris, Silvana
A1 Valencia Gálvez, Paulina
A1 López García, María Luisa
A1 Álvarez Serrano, Inmaculada
A1 Blake, Graeme R.
A1 Galdámez, Antonio
AB 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.
PB MDPI
YR 2023
FD 2023-08-01
LK https://hdl.handle.net/20.500.14352/103523
UL https://hdl.handle.net/20.500.14352/103523
LA eng
NO 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
NO 2023 Descuentos MDPI
NO Fondo Nacional de Desarrollo Científico y Tecnológico (Chile)
DS Docta Complutense
RD 8 abr 2025