| Project/Area Number |
25400354
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Tohoku University |
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Principal Investigator |
Fujita Nobuhisa 東北大学, 多元物質科学研究所, 助教 (70431468)
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| Co-Investigator(Renkei-kenkyūsha) |
TAKAKURA HIROYUKI 北海道大学, 工学研究科, 准教授 (30284483)
TSAI AN-PANG 東北大学, 多元物質科学研究所, 教授 (90225681)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 準結晶 / 近似結晶 / クラスタ / カノニカルセル / 準周期タイリング / アルミ合金 / Ｘ線回折 / 電子線回折トモグラフィ / 構造解析 / X線回折 |
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| Outline of Final Research Achievements |
Although more than 30 years have passed since quasicrystals were discovered, their structural details have remained to be unclarified to a large extent posing one of the greatest mysteries in materials science. In order to elucidate the structure of Al-based icosahedral quasicrystals, we first aim at searching for novel approximant phases, namely crystals with similar local structures to that of the quasicrystals. Then we attempt to analyze the structure of new approximants using single-crystal X-ray diffraction to extract any information regarding the structural propserties of the quasicrystals. Overall, these attempts culminate in the discoveries of a few novel approximant crystals, whereas their structures turn out to be composed of two kinds of clusters forming a dense packing. We also propose a new theoretical model describing the arrangement of the clusters in the quasicrystals.
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