Structural Characterization and Thermoelectric Properties of Br-Doped AgSn<i><sub>m</sub></i>[Sb<sub>0.8</sub>Bi<sub>0.2</sub>]Te<sub>2+<i>m</i></sub> Systems
Herein, we report the synthesis, structural and microstructural characterization, and thermoelectric properties of AgSn<i><sub>m</sub></i>[Sb<sub>0.8</sub>Bi<sub>0.2</sub>]Te<sub>2+<i>m</i></sub> and Br-doped telluride systems....
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MDPI AG
2023-07-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/15/5213 |
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| author | Daniela Delgado Silvana Moris Paulina Valencia-Gálvez María Luisa López Inmaculada Álvarez-Serrano Graeme R. Blake Antonio Galdámez |
| author_facet | Daniela Delgado Silvana Moris Paulina Valencia-Gálvez María Luisa López Inmaculada Álvarez-Serrano Graeme R. Blake Antonio Galdámez |
| author_sort | Daniela Delgado |
| collection | DOAJ |
| description | Herein, we report the synthesis, structural and microstructural characterization, and thermoelectric properties of AgSn<i><sub>m</sub></i>[Sb<sub>0.8</sub>Bi<sub>0.2</sub>]Te<sub>2+<i>m</i></sub> 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 AgSn<i><sub>m</sub></i>[Sb<sub>0.8</sub>Bi<sub>0.2</sub>]Te<sub>2+<i>m</i></sub> ranges from +40 to 57 μV·K<sup>−1</sup>. Br-doped samples with <i>m</i> = 2 show S values of +74 μV·K<sup>−1</sup> at RT, and the Seebeck coefficient increases almost linearly with increasing temperature. The total thermal conductivity (<i>κ</i><sub>tot</sub>) monotonically increases with increasing temperature (10–300 K). The <i>κ</i><sub>tot</sub> values of undoped AgSn<i><sub>m</sub></i>[Sb<sub>0.8</sub>Bi<sub>0.2</sub>]Te<sub>2+<i>m</i></sub> are ~1.8 W m<sup>−1 </sup>K<sup>−1</sup> (<i>m</i> = 4) and ~1.0 W m<sup>−1</sup> K<sup>−1</sup> (<i>m</i> = 2) at 300 K. The electrical conductivity (<i>σ</i>) 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 <i>m</i> = 4. |
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| issn | 1996-1944 |
| language | English |
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| spelling | doaj.art-18032daf932c492ea878b0db127d26602023-11-18T23:10:21ZengMDPI AGMaterials1996-19442023-07-011615521310.3390/ma16155213Structural Characterization and Thermoelectric Properties of Br-Doped AgSn<i><sub>m</sub></i>[Sb<sub>0.8</sub>Bi<sub>0.2</sub>]Te<sub>2+<i>m</i></sub> SystemsDaniela Delgado0Silvana Moris1Paulina Valencia-Gálvez2María Luisa López3Inmaculada Álvarez-Serrano4Graeme R. Blake5Antonio Galdámez6Departamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Santiago 7800003, ChileCentro de Investigación de Estudios Avanzados del Maule (CIEAM), Vicerrectoría de Investigación y Postgrado, Universidad Católica del Maule, Avenida San Miguel 3605, Talca 3480112, ChileDepartamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Santiago 7800003, ChileDepartamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, SpainDepartamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, SpainZernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The NetherlandsDepartamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Santiago 7800003, ChileHerein, we report the synthesis, structural and microstructural characterization, and thermoelectric properties of AgSn<i><sub>m</sub></i>[Sb<sub>0.8</sub>Bi<sub>0.2</sub>]Te<sub>2+<i>m</i></sub> 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 AgSn<i><sub>m</sub></i>[Sb<sub>0.8</sub>Bi<sub>0.2</sub>]Te<sub>2+<i>m</i></sub> ranges from +40 to 57 μV·K<sup>−1</sup>. Br-doped samples with <i>m</i> = 2 show S values of +74 μV·K<sup>−1</sup> at RT, and the Seebeck coefficient increases almost linearly with increasing temperature. The total thermal conductivity (<i>κ</i><sub>tot</sub>) monotonically increases with increasing temperature (10–300 K). The <i>κ</i><sub>tot</sub> values of undoped AgSn<i><sub>m</sub></i>[Sb<sub>0.8</sub>Bi<sub>0.2</sub>]Te<sub>2+<i>m</i></sub> are ~1.8 W m<sup>−1 </sup>K<sup>−1</sup> (<i>m</i> = 4) and ~1.0 W m<sup>−1</sup> K<sup>−1</sup> (<i>m</i> = 2) at 300 K. The electrical conductivity (<i>σ</i>) 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 <i>m</i> = 4.https://www.mdpi.com/1996-1944/16/15/5213telluridesSeebeck coefficientthermal conductivitylead-free thermoelectric materials |
| spellingShingle | Daniela Delgado Silvana Moris Paulina Valencia-Gálvez María Luisa López Inmaculada Álvarez-Serrano Graeme R. Blake Antonio Galdámez Structural Characterization and Thermoelectric Properties of Br-Doped AgSn<i><sub>m</sub></i>[Sb<sub>0.8</sub>Bi<sub>0.2</sub>]Te<sub>2+<i>m</i></sub> Systems Materials tellurides Seebeck coefficient thermal conductivity lead-free thermoelectric materials |
| title | Structural Characterization and Thermoelectric Properties of Br-Doped AgSn<i><sub>m</sub></i>[Sb<sub>0.8</sub>Bi<sub>0.2</sub>]Te<sub>2+<i>m</i></sub> Systems |
| title_full | Structural Characterization and Thermoelectric Properties of Br-Doped AgSn<i><sub>m</sub></i>[Sb<sub>0.8</sub>Bi<sub>0.2</sub>]Te<sub>2+<i>m</i></sub> Systems |
| title_fullStr | Structural Characterization and Thermoelectric Properties of Br-Doped AgSn<i><sub>m</sub></i>[Sb<sub>0.8</sub>Bi<sub>0.2</sub>]Te<sub>2+<i>m</i></sub> Systems |
| title_full_unstemmed | Structural Characterization and Thermoelectric Properties of Br-Doped AgSn<i><sub>m</sub></i>[Sb<sub>0.8</sub>Bi<sub>0.2</sub>]Te<sub>2+<i>m</i></sub> Systems |
| title_short | Structural Characterization and Thermoelectric Properties of Br-Doped AgSn<i><sub>m</sub></i>[Sb<sub>0.8</sub>Bi<sub>0.2</sub>]Te<sub>2+<i>m</i></sub> Systems |
| title_sort | structural characterization and thermoelectric properties of br doped agsn i sub m sub i sb sub 0 8 sub bi sub 0 2 sub te sub 2 i m i sub systems |
| topic | tellurides Seebeck coefficient thermal conductivity lead-free thermoelectric materials |
| url | https://www.mdpi.com/1996-1944/16/15/5213 |
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