| Project/Area Number |
07044047
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Institution | Hokkaido University |
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Principal Investigator |
NAKAMURA Yosio Graduate School of Science, Hokkaido University, Professor, 大学院・理学研究科 (70000809)
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| Co-Investigator(Kenkyū-buntansha) |
MAURIN Pierr CNRSリヨンI大学, 助手
PERNOT Etien CNRSリヨンI大学, 助手
HAZEMANN Jea CNRSグルノーブル大学, 研究員
GEAYMOND Oli CNRSグルノーブル大学, 技術研究員
RAOUX Denis CNRSグルノーブル大学, 研究教授
ARGOUD Roger CNRSグルノーブル大学, 技術研究員
SOLDO Yvonne CNRSグルノーブル大学, 研究員
JAL JeanーFra CNRSリヨンI大学, 主席研究員
DUPUYーPHILON ジョゼット CNRSリヨンI大学, 研究教授
SAKAGUCHI Yoshifumi Japan Society for the Promotion of Science (JSPS), Researcher, 特別研究員
KAWAMURA Junichi Hokkaido University, Lecturer, 大学院・理学研究科, 講師 (50142683)
KAMIYAMA Takashi Hokkaido University, Associate Professor, 工学部, 助教授 (50233961)
INUI Masanori Hiroshima University, Associate Professor, 総合科学部, 助教授 (40213136)
TAMURA Kozaburo Hiroshima University, Professor, 総合科学部, 教授 (30155262)
DENIS Raoux CRNS University of Grenoble, Research Director
ROGER Argoud CRNS University of Grenoble, Researcher
YVONNE Soldo CRNS University of Grenoble, Researcher
JEAN-FRANCOIS Jal CRNS University of Lyon I,Researcher
JOSETTE Duppuy-Philon CRNS University of Lyon I,Research Director
OLIBIER Geaymond CRNS University of Grenoble, Researcher
PIERRE-OLIVIER Maurin CRNS University of Lyon I,Instructor
ETIENNE Pernot CRNS University of Lyon I,Researcher
JEAN-LOUIS Hazemann CRNS University of Grenoble, Researcher
JOSETTE Dupu CNRSリヨンI大学, 研究教授
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥11,200,000 (Direct Cost: ¥11,200,000)
Fiscal Year 1996: ¥5,300,000 (Direct Cost: ¥5,300,000)
Fiscal Year 1995: ¥5,900,000 (Direct Cost: ¥5,900,000)
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| Keywords | supercritical fluids / fluid selenium / semiconductor-metal transition / synchrotron radiation / glasses / electrolyte solutions / nuclear magnetic resonance / neutron scattering / 金属-非金属転移 / セレン / 電解質水溶液 / 分子運動 / XAFS / NMR |
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| Research Abstract |
The main results of the present research project are summarized as follows.
1) It is known that liquid Se sohws a semiconductor-metal transition on expansion above the liquid-gas critical point (1615ﾟC,385 bar). The Hiroshima group has carried out energy dispersive-X-ray diffraction, small angle X-ray diffraction, and XAFS experiments in order to investigate the mechanism of this transition from the change of atomic arrangements. They have succeeded in XAFS and XD measurements for the first time on liquid and supercritical Se, by use of intensive X-rays source of ESRF at Grenoble with cooperation of French scientists. It has been found that the two-fold coordinated structure still remains in the metallic region and that the bond length decreases at the semiconductor to metal transition. They proposed a model in which a planer zigzag structure of Se plays an important role in the metallization of the system.
2) Concentrated aqueous solutions of LiC1 are very viscous and easily vitrified. In order to investigate dynamics of water molecules and ions, the Hokkaido group performed the neutron scattering and NMR (relaxation and diffusion coefficient) measurements with the French group from Lyon. In particular, they have succeeded to measure the diffusion coefficients and the NMR relaxation times of water in supercooled concentrated LiCl solutions. The results are compared with the results from Muon spectroscopy already obtained by the French group.
3) While mutual visiting of Japanese and French scientists to perform the present research project were successfully achieved, we have tried to extend the project in future, by use of high pressure-high temperature NMR (Hokkaido University) and high pressure-high temperature XRD (Hiroshima University). The training of French young researchers in Sapporo and Hiroshima was very useful and promising for further development of each group participated in this project.
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