| Project/Area Number |
22K14143
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 18010:Mechanics of materials and materials-related
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| Research Institution | Osaka University |
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Principal Investigator |
Li Yan 大阪大学, 大学院基礎工学研究科, 助教 (70930171)
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| Project Period (FY) |
2022-04-01 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2022: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | 転位 / 無機化合物 / compound semiconductors / crystal plasticity / dislocations / oxides / nitrides / photoindentation / Photoindentation / ウルツ鉱型結晶 / 力学特性 |
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| Outline of Research at the Start |
The influence of light illumination on the mechanical properties of semiconductors has drawn increasing attention recently. Research on ZnS has demonstrated large plasticity in complete darkness. Extending research to other materials will open up the possibility of tuning material properties by controlling the light environment. In this research, we will study the effects of light on different slip systems in wurtzite crystals, which will greatly contribute to innovating the processing methods for modifying the plasticity of brittle materials.
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| Outline of Final Research Achievements |
Inorganic semiconductor compounds are typically brittle at room temperature, which has limited their applications nowadays. Since 2018, research has shown that ZnS crystals exhibit brittle fracture under white light, but show notable plasticity in darkness. However, the impact of light on the mechanical properties of such materials is not fully understood. In this study, in-situ nanoindentation experiments with a controllable lighting system were adopted to evaluate the mechanical responses at the nanoscale under varying light conditions. Tests on ZnS single crystals demonstrated that the dislocation nucleation in ZnS nanoindentation is strain-rate insensitive both in light and in darkness. Experiments on ZnO revealed that light slightly affects the dislocation nucleation in ZnO, but significantly influences dislocation motion.
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| Academic Significance and Societal Importance of the Research Achievements |
材料がどのように変形し、破壊していくのかという基本的な現象を解明することは、材料を利用する分野において重要な課題である。最近では光環境が材料の強度特性に影響を及ぼすことが発見され、注目されている。しかし、その現象の理解は未だ不十分であり、メカニズムを解明することが期待されている。本研究では、異なる光環境下で硫化亜鉛および酸化亜鉛の転位挙動をナノスケールで評価し、これらの材料の室温塑性変形挙動の一端を解明することに成功した。これらの成果は無機半導体材料のよりよい材料加工技術の開発に貢献すると考えられる。
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