The studies on the structural varitations related to hydrogen bonding symmetrization of hydrous minerals
| Project/Area Number |
25400507
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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 |
Petrology/Mineralogy/Economic geology
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| Research Institution | Tohoku University |
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Principal Investigator |
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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 |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | 水素結合の対称化 / 単結晶構造解析 / 高圧 / 高圧含水相 / 放射光Ｘ線回折 / δ-AlOOH / 圧力誘起相転移 / 含水素鉱物 / Al含有phase D / 放射光Ｘ線単結晶回折 / 単結晶Ｘ線回折 / 放射光 |
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| Outline of Final Research Achievements |
Single crystal X-ray diffraction studies on delta-AlOOH were conducted to clarify its structural change under high-pressure conditions. Around 8 GPa, the pressure induced phase transition was observed, which is second order phase transition. The space group was changed from P21nm to Pnnm. The evolutions of axial ratio (a/c and b/c) with pressure were significantly changed around the phase transition pressure. Structure determination of the post-transition phase was successful, and the O-O distance related to hydrogen bonding was significantly compressed with pressure. This findings shows that the hydrogen bonding in delta-AlOOH was made more strengthen. As the results, hydrogen in the post-transition phase was arranged disorderly between its two equivalent sites. Hydrogen bonding does not show the hydrogen bonding symmetrization strictly up to 8 GPa.
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Report
(4 results)
Research Products
(17 results)
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[Journal Article] Synthesis of large and homogeneous single crystals of water-bearing minerals by slow cooling at deep-mantle pressures2015
Author(s)
Okuchi, T., Purevjav, N., Tomioka, N., Lin, J-F., Kuribayashi, T., Schoneveld, T., Hwang, H., Dunkel, K., Sakamoto, N., Kawasaki, N. and Yurimoto, H
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Journal Title
American Mineralogist
Volume: 100
Pages: 1483-1492
Related Report
Peer Reviewed / Int'l Joint Research
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[Presentation] The stability and water solubility of possible Al-bearing high pressure hydrous and nominally anhydrous minerals in the mantle2015
Author(s)
T. Inoue, S. Kakizawa, N. Cai, K. Fujino, T. Kuribayashi, T. Nagase, S. Greaux, Y. Higo, N. Sakamoto, and H. Yurimoto
Organizer
Goldschmidt Conference
Place of Presentation
Prague, Czech (プラハ，チェコ共和国)
Year and Date
2015-08-16
Related Report
Int'l Joint Research
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