Enhanced thermoelectric performance in PbSe-SrSe solid solution by Mn substitution
| Autor: | Jun Luo, Ping Huang, Lijiaokai Zeng, Lu Ouyang, Juanjuan Xing, Yefeng Liu, Haiya Zheng, Jiye Zhang, Li You |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Mechanical Engineering Doping Metals and Alloys Analytical chemistry Mineralogy 02 engineering and technology Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology Thermoelectric materials 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Mechanics of Materials Lattice (order) Thermoelectric effect Materials Chemistry Figure of merit 0210 nano-technology Lead selenide Solid solution |
| Zdroj: | Journal of Alloys and Compounds. 687:765-772 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2016.06.172 |
| Popis: | Crystal structures, thermoelectric and mechanical properties of p-type PbSe-SrSe system were investigated over the full composition range. A continuous solid solution was formed in the PbSe-SrSe system. Na doping was used to modulate the carrier concentration of the system. The concentrations of Sr and Na for optimum thermoelectric performance of the system were determined to be 6% and 0.8%, respectively. The figure of merit ZT at 813 K was increased from 0.58 for non-Sr containing PbSe (with 2% Na doping) to 0.8 for Na and Sr optimized PbSe-SrSe solid solution. Then, Mn was introduced into the solid solution to further optimize the thermoelectric properties. The addition of Mn could generate nanosized particle-like Mn-rich precipitates in the matrix of PbSe-SrSe alloys and substantially reduce the lattice thermal conductivities. As a result, when half of the 6% Sr was replace by Mn, the ZT at 813 K could be further raised to ∼1.03. Furthermore, the presence of the Mn-rich precipitates could effectively strengthen the mechanical properties of the PbSe-SrSe alloys, which is favorable for the future practical applications of the PbSe materials. |
| Databáze: | OpenAIRE |
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