| Project/Area Number |
25610156
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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 | Osaka University |
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Principal Investigator |
KONDO Tadashi 大阪大学, 理学(系)研究科(研究院), 教授 (20252223)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 氷天体 / 相転移 / 磁化率 / 低温高圧 / 氷 / 磁化率測定 / SQUID |
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| Outline of Final Research Achievements |
Water ice is universal material in space and has fifteen polymorphs reported so far. In this study, we tested a possibility of new method for studying structural change of ice using magnetic measurement. Experiments were conducted in Superconducting Quantum Interference Device magnetometer (SQUID, MPMS-7, Quantum design). We measured the magnetic moment of ice at temperature below room condition and/or at high-pressure condition to 0.2GPa. Pure water or salted water was used as starting sample. After accurate evaluation of magnetic moment of surrounding materials, solid-liquid transition of sample was detected with abrupt decrease of magnetic susceptibility. In the case of salt water, magnetic susceptibility decreased gradually with a temperature. In the high-pressure run, we found another jump in the profile. The condition was close to solid- solid phase boundary proposed. In this way, we successfully detected phase transition between liquid and solid in pure H2O and binary system.
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