2015 Fiscal Year Final Research Report
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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| 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 |
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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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| Free Research Field |
鉱物結晶学
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