| Project/Area Number |
15K13594
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Petrology/Mineralogy/Economic geology
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| Research Institution | Ehime University |
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Principal Investigator |
Sakai Takeshi 愛媛大学, 地球深部ダイナミクス研究センター, 講師 (90451616)
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| Research Collaborator |
Yagi Takehiko
Irifune Tetsuo
Kadobayashi Hirokazu
Kunimoto Takehiro
Ohfuji Hiroaki
Hirao Naohisa
Kawaguchi Saori
Ohishi Yasuo
Tateno Shigehiko
Hirose Kei
Dekura Haruhiko
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | ２段式ダイヤモンドアンビルセル / 集束イオンビーム加工装置 / マルチメガバール / 圧力スケール / 状態方程式 / ナノ多結晶ダイヤモンド(NPD) / 超高圧発生 |
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| Outline of Final Research Achievements |
We have developed a double stage diamond anvil cell (ds-DAC) technique for reproducible pressure by precisely fabricating 2nd stage anvils using a focused ion beam (FIB) system. Rhenium sample was successfully compressed to V/V0 = 0.633. The calculated pressure for this minimum volume varies from 430 GPa to 630 GPa, depending on the choice of the equation of state of rhenium. We conclude that the most likely pressure achieved for the minimum volume of rhenium is in a range of 430-460 GPa based on a calibration using the platinum pressure scale to 280 GPa and the latter value of 630 GPa is unreasonably high, suggesting that the pressures in an earlier study for the equation of state of rhenium would have been significantly overestimated.
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