Phase Transition Study of C_<7O> Crystal at around 340 K by Single-Crystal X-Ray Diffraction
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概要
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Structural changes of C_70 crystals were investigated in the temperature range between 295 K and 575 K by a single-crystal X-ray diffraction using a precession camera. The crystal structure is based on a deformed hcp with axial ratio c/a = 1.85 at room temperature showing a remarkable stacking fault along the c axis. Contraction of the c axis and a slight expansion of the a axis take place at the temperature around 340 K, and as a result, the structure becomes close to an ideal hcp structure with c/a=1.65. Hysteresis of a wide temperature range is also ob-served with the change of lattice constants. During phase transition, twinning by (-1 O 2) often occurs by the combination of 90° rotation and shuffling of C_70 ellipsoid molecules. The mechanism of the twin formation is also discussed.
- 社団法人応用物理学会の論文
- 1994-11-15
著者
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Kishio Kohji
Department Of Applied Chemistry Faculty Of Engineering University Of Tokyo
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Horiuchi Hiroyuki
Department Of Applied Chemistry Faculty Of Engineering University Of Tokyo
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Horiuchi Hiroyuki
Department Of Agricultural Chemistry The University Of Tokyo
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KINO Nobuhiro
Department of Applied Chemistry, Faculty of Engineering, University of Tokyo
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Ono Yoko
Mineralogical Institute Faculty Of Science University Of Tokyo
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Kino Nobuhiro
Department Of Applied Chemistry Faculty Of Engineering University Of Tokyo
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Li Jing
Department Of Agriculture Faculty Of Agriculture Kochi University
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MITSUKI Tohru
Mineralogical Institute, Faculty of Science, University of Tokyo
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KITAZAWA Kohichi
Department of Applied Chemistry, Faculty of Engineering, University of Tokyo
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Mitsuki Tohru
Mineralogical Institute Faculty Of Science University Of Tokyo
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Kitazawa Kohichi
Department Of Applied Chemistry Faculty Of Engineering University Of Tokyo
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Li Jing
Department Of Applied Chemistry Faculty Of Engineering University Of Tokyo:(present Address)institut
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