2021 Fiscal Year Final Research Report
The growth of single crystal ice VII and the estimation of its elastic and electrical properties under hydrostatic pressure
Project/Area Number |
19K03698
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
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Research Institution | Gifu University |
Principal Investigator |
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Keywords | 氷VII相 / 高圧力 / 状態方程式 / 弾性定数 / X線回折 / ブリュアン散乱 |
Outline of Final Research Achievements |
High-pressure X-ray diffraction measurements for single crystal and powder Ice VII with and without glycerol as a pressure transmitting medium and high-pressure Brillouin measurements for single crystalline Ice VII with and without glycerol have been performed up to about 15 GPa. As a result, the equation of state, elastic constants, and bulk modulus have been determined as a function of pressure up to 5.5 GPa under fully hydrostatic pressure and up to 15 GPa under quasi-hydrostatic pressure. In addition to that, the present experiments clarifies that a uniaxial stress induces the decrease in the lattice volume and the increase in the elastic constants of Ice VII, and also shows no contribution to proton conduction in Ice VII in respect of its elastic properties.
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Free Research Field |
高圧物質科学
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Academic Significance and Societal Importance of the Research Achievements |
氷VII相は高圧氷の代表的な相であり,約60 GPaもの広い圧力領域で存在している。その基礎物性の精細決定は基礎物理学のみならず,氷惑星を含む惑星科学にも大きく貢献することが期待できる。本研究では,明確な圧力依存性が決定されていなかった氷VII相の状態方程式,弾性的性質を安定した静水圧力条件で決定したものであり,氷VII相にかかわる研究の基礎情報となる。また,5.5 GPa までではあるが,氷VII相を完全な静水圧力下で実験できる圧力媒体グリセロールを見出したことは,今後の氷VII相の精密な高圧物性評価につながると考える。
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