Phase Transition Scheme of Isolated Hydrogen-bonded Material h-MeHPLN Studied by Neutron and X-ray Diffraction(Condensed Matter : Structure, Mechanical and Thermal Properties)
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概要
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The antiferroelectric material with an isolated hydrogen-bond, h-MeHPLN (5-methyl-9-hydroxyphe-nalenon), was structurally investigated by X-ray and neutron diffraction experiments in the low-temperature phase (T_c=42K). The formation of a superlattice of 2×b was found below T_c, and the space group was identified to be P2_1/c transformed from C2/c. Accordingly, the number of crystallographically independent molecules became two. The electron density distribution and the nuclear density distribution revealed some significant features below T_c. One of the independent molecules exhibits an ordering of the hydrogen atom in the hydrogen-bond region, a conformational ordering of the methyl group and a molecular rotation around the a-axis. Moreover, a static electronic dipole moment is found in the hydrogen-bond region in this molecule. In contrast, the other molecule shows a disordered hydrogen atom, disordered conformation of the methyl group, no molecular rotation and a disordered electronic dipole moment. These features can be described simply in terms of a modulation wave of an order parameter.
- 一般社団法人日本物理学会の論文
- 2005-02-15
著者
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Kiyanagi Ryoji
Institute Of Multidisciplinary Research For Advanced Materials Tohoku University:(present Office)int
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Mochida Tomoyuki
Department Of Chemistry Faculty Of Science Toho University
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Kojima Akiko
Graduate School Of Science And Technology Faculty Of Science Chiba University
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Sugawara Tadashi
Department Of Basic Science Graduate School Of Arts & Sciences The University Of Tokyo
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Watanabe Masashi
Institute Of Multidisciplinary Research For Advanced Materials Tohoku University
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NODA Yukio
Institute of Multidisciplinary Research for Advanced Materials
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Kimura Hiroyuki
Institute for Protein Research, Osaka University
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