Effect of Na and Ba co-doping on the structure and thermoelectric performance of PbTe0.5Se0.5
| Autor: | S.L. Zhang, Junqin Li, Y. Li, Weiqin Ao, Y.Q. Gui, Y.S. Zheng, Fuyuan Liu |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics business.industry Mechanical Engineering Doping Metals and Alloys Analytical chemistry Spark plasma sintering 02 engineering and technology Conductivity 021001 nanoscience & nanotechnology Condensed Matter Physics Thermoelectric materials 01 natural sciences Semiconductor Mechanics of Materials Seebeck coefficient 0103 physical sciences Thermoelectric effect Figure of merit General Materials Science 0210 nano-technology business |
| Zdroj: | Scripta Materialia. 120:9-13 |
| ISSN: | 1359-6462 |
| Popis: | PbTe-based semiconductor thermoelectric materials are currently active areas of research. In this work, Na- and Ba-doped PbTe 0.5 Se 0.5 alloys were prepared by vacuum melting and spark plasma sintering techniques. Na doping suppressed the transition of PbTe 0.5 Se 0.5 from p-type to n-type conductivity and adjusted the carrier concentration. In the case of Na 0.02 (Ba x Pb 1 − x ) 0.98 Te 0.5 Se 0.5 , doping with Ba increased the Seebeck coefficient, decreased the thermal conductivity, and improved the thermoelectric performance compared to those of the undoped material. A high figure of merit ( ZT ) value of 1.17 at 723 K was obtained for Na 0.02 (Ba 0.06 Pb 0.94 ) 0.98 Te 0.5 Se 0.5 , which is approximately 22% greater than that of the undoped sample. |
| Databáze: | OpenAIRE |
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