国際宇宙ステーションを利用した均一組成SiGe結晶の育成 (2) Traveling Liquidus Zone (TLZ)法による育成実験と微小重力効果

DOI:10.15011//jasma.34.340113
Int. J. Microgravity Sci. Appl. 2017p340113
論文著者
木下 恭一,荒井 康智,稲富 裕光,塚田 隆夫
所属組織
日本宇宙フォーラム 宇宙利用事業部,明治大学理工学部物理学科,宇宙航空研究開発機構 有人宇宙技術部門,宇宙航空研究開発機構 宇宙科学研究所,東北大学大学院工学研究科
要約
Total of four SiGe crystal growth experiments by the traveling liquidus-zone (TLZ) method have successfully been performed aboard the “Kibo” in 2013 and 2014. Results show that the TLZ method is a powerful method for growing compositionally uniform mixed crystals. On the ground, convection in a melt stops crystal growth and long crystals are difficult to be grown, while in microgravity long and large homogeneous crystals are grown in the diffusion limited regime. Step temperature change by 1 ℃ during crystal growth resulted in interface marking and growth rates in the axial and radial directions were measured precisely. Growth conditions for achieving radial uniformity were obtained. Growth instability at the initial stage was made clear, which was observed in microgravity for the first time. It is shown that convection in a melt has a merit of avoiding such instability.
Keyword(s)
SiGe bulk crystal, Growth, Convection, Diffusion, Constitutional supercooling, Gradient heating furnace
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Received 1 November 2016, Accepted 12 January 2017, Published 31 January 2017

© The Japan Society of Microgravity Applicaiton

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