| Project/Area Number |
09640619
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical chemistry
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| Research Institution | Okazaki National Research Institutes |
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Principal Investigator |
INOKUCHI Hiroo Institute for Mblecular Science, Emeritus Professor, 分子科学研究所, 名誉教授 (00100826)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Syugo University of Tsukuba, Inst.of Material Sci., Lecturer, 物質工学系, 講師 (90241794)
NAKAHARA Yusuke Miyakonojo National College of Technology, Professor, 教授 (80044543)
ICHIMURA Kenji Kumamoto Univesrsity, Dept.of Science, Professor, 理学部, 教授 (00151481)
YAKUSHI Kyuya Institute for Molecular Science, Professor, 分子科学研究所, 教授 (20011695)
緒方 啓典 岡崎国立共同研究機構, 分子科学研究所, 助手 (10260027)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1997: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | hydrogen / fullerene / organic superconductor / C_<60> / ternary compound / cytochrome / 超伝導 / ナトリウムドープC_<60> / 粉末X線回折 / リ-トベルト解析 / 相転移 |
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| Research Abstract |
In 1997, we established the conversion method from the non-superconducting (SC) phase to SC phase, facing the problem in the sample preparation of Na-H-C_<60> that contrary to the SC phase, the non-SC phase is also obtained.We demonstrated the crystal structures of non-SC and SC phases by Rietveld analysis.We found that Na-H-C_<60> absorbs the gas such as H_2, D_2, He etc.and applied this result for a patent
In 1998, we performed the theoretical calculation for the SC Na-H-C_<60> phase using the atomic coordinate obtained from the Rietveld analysis and demonstrated that hydrogen exists not as a neutral but as a fractionally charged spacer and conduction electrons on the hydrogen atoms strongly correlate with superconductivity.Furthermore, we newly prepared K-H-C_<60> and Na-NH_2-C_<60> superconductors as a member of three component organic superconductors.We confirmed that (KH)_3C_<60> had a larger lattice constant than K_3C_<60> and experimentally detected hydrogen from thermal desorption and solid state ^1H NMR studies.As further interesting result, we found that (NaH)_<4-X>(KH) _XC_<60> (x=0.1, 0.5, 1, 2 and 3) shows superconductivity and they are stable superconductors, in contrast to Na-H-C_<60>.This finding enables us to prepare large amounts of SC samples including hydrogen.We are now ready for neutron diffraction study to directly detect hydrogen, which will make a great advance in this research.
We think that the above mentioned results will be useful to understand the mechanism of electron conduction in an anaerobic electron transfer biological material Cytochrome c_3 (molecular weight 13,955) which shows extremely high conductivity by reduction under high pressure hydrogen.
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