Directional Solidification and Thermoelectric Properties of Undoped Mg2Sn Crystal
| Autor: | Xin Li, Hengzhi Fu, Shuangming Li, Song-Ke Feng, Hong Zhong |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Mineralogy Crystal growth 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology Condensed Matter Physics Thermoelectric materials 01 natural sciences Electronic Optical and Magnetic Materials Crystal Thermal conductivity Seebeck coefficient 0103 physical sciences Thermoelectric effect Materials Chemistry Electrical and Electronic Engineering 0210 nano-technology Directional solidification |
| Zdroj: | Journal of Electronic Materials. 45:2895-2903 |
| ISSN: | 1543-186X 0361-5235 |
| Popis: | Single-phase Mg2Sn crystal has been successfully directionally solidified from the melt with a high temperature gradient of 185 K cm−1. The solidified distance for the growth of single-phase Mg2Sn crystal was predicted theoretically and agreed well with the experimental result. The grown Mg2Sn crystals exhibit better thermoelectric performance and high thermoelectric figure of merit along the growth direction. In the temperature range from 300 K to 700 K, the maximum Seebeck coefficient S and electrical conductivity σ reached −261 μV K−1 and 525 Ω−1 m−1, respectively. The minimum thermal conductivity κ was measured to be 4.3 W m−1 K−1, and the lattice thermal conductivity approximated 90% of the bulk thermal conductivity of the crystal. The method developed in this work provides a methodological reference for preparation of Mg2BIV and its doped and solid-solution compounds. |
| Databáze: | OpenAIRE |
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