Low Thermal Conductivity of Bulk Amorphous Si1−xGe x Containing Nano-Sized Crystalline Particles Synthesized by Ball-Milling Process
In: Journal of Electronic Materials, Jg. 47 (2018-02-05), S. 3260-3266
Online
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Zugriff:
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.
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Low Thermal Conductivity of Bulk Amorphous Si1−xGe x Containing Nano-Sized Crystalline Particles Synthesized by Ball-Milling Process
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Autor/in / Beteiligte Person: | Ikeda, Hiroya ; Santhanakrishnan, Harish ; Takeuchi, Tsunehiro ; Muthusamy, Omprakash ; Nishino, Shunsuke ; Inukai, Manabu ; Yamamoto, Yoshiyuki ; Sobota, Robert ; Kiyama, Makato ; Hayakawa, Yasuhiro ; Ghodke, Swapnil ; Adachi, Masahiro |
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Zeitschrift: | Journal of Electronic Materials, Jg. 47 (2018-02-05), S. 3260-3266 |
Veröffentlichung: | Springer Science and Business Media LLC, 2018 |
Medientyp: | unknown |
ISSN: | 1543-186X (print) ; 0361-5235 (print) |
DOI: | 10.1007/s11664-018-6103-2 |
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