Thermoelectric properties and extremely low lattice thermal conductivity in p-type Bismuth Tellurides by Pb-doping and PbTe precipitation
| Autor: | Chan-Chieh Lin, R. Lydia, Min Ho Lee, Dianta Ginting, Jong-Soo Rhyee |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Condensed matter physics Mechanical Engineering Doping Metals and Alloys chemistry.chemical_element 02 engineering and technology Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology Thermoelectric materials 01 natural sciences 0104 chemical sciences Bismuth Thermal conductivity chemistry Mechanics of Materials Electrical resistivity and conductivity Seebeck coefficient Thermoelectric effect Materials Chemistry 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 671:538-544 |
| ISSN: | 0925-8388 |
| Popis: | We investigated the thermoelectric properties of Pb-doped compounds (Bi 0.2 Sb 0.8− x Pb x ) 2 Te 3 and pseudo-binary PbTe composites of [(Bi 0.2 Sb 0.8 ) 2 Te 3 ] 1−2 x (PbTe) 2 x ( x = 0.0, 0.01, 0.02, 0.05, and 0.10). The Pb-doping and PbTe-precipitation enhanced their metallic properties, as confirmed by the increase in electrical conductivity and carrier density, and the decrease in Seebeck coefficient and Hall mobility. We obtained the exceptionally low lattice thermal conductivity of 0.2 W m −1 K −1 from the single parabolic band model, which can be justified by the good fitting with the Pisarenko plot. Because of the high electrical conductivity at room temperature and high Seebeck coefficient at high temperature, with the decrease in thermal conductivity with increasing temperature, the thermoelectric figure-of-merits ZT were enhanced in the mild temperature range, which can be advantageous in energy harvesting technologies. |
| Databáze: | OpenAIRE |
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