2000 Fiscal Year Final Research Report Summary
Development of Neutron 4-circle Diffractometer for studies of Structural Phase Transition
| Project/Area Number |
09354004
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| Research Category |
Grant-in-Aid for Scientific Research (A).
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
固体物性Ⅰ(光物性・半導体・誘電体)
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| Research Institution | Tohoku University (1998-2000)
Chiba University (1997) |
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Principal Investigator |
NODA Yukio Tohoku University, Res.Inst.for Scient.Meas., Professor, 科学計測研究所, 教授 (80127274)
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| Co-Investigator(Kenkyū-buntansha) |
KAJITANI Tsuyoshi Faculty of Engineering, Tohoku University, Professor, 工学研究科, 教授 (80134039)
KIMURA Hiroyuki Res.Inst.for Scient.Meas., Tohoku University, Associate Researcher, 科学計測研究所, 助手 (50312658)
WATANABE Masashi Res.Inst.for Scient.Meas., Tohoku University, Associate Researcher, 科学計測研究所, 助手 (60312659)
OSHIMA Kenichi Tsukuba University, Professor, 物理工学系, 教授 (70109271)
SAWA Hiroshi Chiba University, Associate Professor, 自然科学研究科, 助教授 (50215901)
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| Project Period (FY) |
1997 – 2000
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| Keywords | Neutron Scattering / Single Crystal / 4-circle Diffractometer / Structural Phase transition |
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| Research Abstract |
We have developed a 4-circle diffractometer for a single crystal experiment at the guidehall of the reactor JRR3M-JAERI (Japanese Research Reactor) at Tokai. The name of the diffractometer was adapted as FONDER (Four-Circle Off-center Type Diffractometer). We also developed a horizontally and vertically bend monochromatore with silicon plates. We could succeed to get well-focused neutron beam as a size of 1cm times 2cm at the sample position by using nine Si422 plates. Wavelength of the neutron is 1.54A at the moment and the maximum scattering angle of a sample is 156 degree. We investigated several hydrogen bond materials like squaric acid and MeHPLN, oxide materials such as CuGeO_3, an oxide ferroelecric and antiferromagnetic compound YMn_2O_5, and obtained their structure and the phase transition scheme. We also studied structure and magnetic structure of manganese fluoride MnF_2. Very good R-factor was obtained, and electron density which is carrying spins was obtained. Maximum entropy method and Fourier synthesis methods were applied to btain nuclear density with great success. Structure analysis with neutron is now available.
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