Sodium doped polycrystalline SnSe: High pressure synthesis and thermoelectric properties
| Autor: | Yongjun Tian, Bowen Cai, Hao Sun, Peng Zhao, Long Zhang, Fengrong Yu, Dongli Yu, Jianghua Li, Bo Xu |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Mechanical Engineering Tin selenide Doping Metals and Alloys Analytical chemistry Mineralogy Spark plasma sintering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Thermal conductivity chemistry Mechanics of Materials Electrical resistivity and conductivity Thermoelectric effect Materials Chemistry Crystallite 0210 nano-technology Anisotropy |
| Zdroj: | Journal of Alloys and Compounds. 727:1014-1019 |
| ISSN: | 0925-8388 |
| Popis: | p -type Na x Sn 1- x Se bulks were prepared by combining high pressure synthesis and spark plasma sintering. The final samples were characterized with XRD and SEM, and demonstrated strong structural anisotropy with the b-c planes in the grains preferentially orientated perpendicular to the SPS compressing direction. High pressure prompted Na doping process and increased the hole concentration up to 3.08 × 10 19 cm −3 in Na 0.02 Sn 0.98 Se, leading to significant increased electrical conductivity and power factor. Meanwhile, the thermal conductivity was substantially suppressed after Na doping. The highest ZT of 0.87 was achieved in the optimal Na 0.02 Sn 0.98 Se at 798 K measured along the direction perpendicular to the SPS compressing. |
| Databáze: | OpenAIRE |
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