| 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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| 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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