Low Thermal Conductivity of Bulk Amorphous Si1−xGe x Containing Nano-Sized Crystalline Particles Synthesized by Ball-Milling Process
| Autor: | Hiroya Ikeda, Harish Santhanakrishnan, Tsunehiro Takeuchi, Omprakash Muthusamy, Shunsuke Nishino, Manabu Inukai, Yoshiyuki Yamamoto, Robert Sobota, Makato Kiyama, Yasuhiro Hayakawa, Swapnil Ghodke, Masahiro Adachi |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Scattering Alloy 02 engineering and technology Atmospheric temperature range engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Hot pressing 01 natural sciences Electronic Optical and Magnetic Materials Amorphous solid Thermal conductivity Nanocrystal 0103 physical sciences Materials Chemistry engineering Electrical and Electronic Engineering Composite material 0210 nano-technology Ball mill |
| Zdroj: | Journal of Electronic Materials. 47:3260-3266 |
| ISSN: | 1543-186X 0361-5235 |
| Popis: | Amorphous Si0.65Ge0.35 powder containing a small amount of nano-sized crystalline particles was synthesized by means of the mechanical alloying process. Hot pressing for 24 h under the pressure of 400 MPa at 823 K, which is below the crystallization temperature, allowed us to obtain bulk amorphous Si-Ge alloy containing a small amount of nanocrystals. The thermal conductivity of the prepared bulk amorphous Si-Ge alloy was extremely low, showing a magnitude of less than 1.35 Wm−1 K−1 over the entire temperature range from 300 K to 700 K. The sound velocity of longitudinal and transverse waves for the bulk amorphous Si0.65Ge0.35 were measured, and the resulting values were 5841 m/s and 2840 m/s, respectively. The estimated mean free path of phonons was kept at the very small value of ∼ 4.2 nm, which was mainly due to the strong scattering limit of phonons in association with the amorphous structure. |
| Databáze: | OpenAIRE |
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