Roles of Cation and Anion Molecules in Ferridistortive Phase Transition in [A(CH_3)_4]_2XBr_4 Type Crystals
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概要
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In order to clarify the roles of cation and anion molecules in the ferridistortive phase transition, four kinds of single crystals of [A(CH_3)^+_4]_2XBr^<2->_4 type, where cat-ion sites are occupied either by tetramethylphosphonium ion P(CH_3)^+_4 or by tetramethylammonium ion N(CH_3)^+_4, and anion site either by tetrabromocobaltate ion CoBr^<2->_4 or by tetrabromomanganate ion MnBr^<2->_4, have been grown. The temperature dependence of the spontaneous shear strain x_<5s>(T)=(π/180°)(β(T)-90°), where β(T) is the monoclinic angle, has been measured from 420 K down to 20 K. The substitution for cations is found to cause a major change in the temperature dependence of x_<5s>(T), while the substitution for anion only a minor one. The results are explained on the basis of a ferridistortive model whose spontaneous strain consists of two kinds of sublattice strains. It is concluded that cations A(CH_3)^+_4 play a primary role in the ferridistortive phase transition in [A(CH_3)^+_4]_2XBr^<2->_4 type crystals, while anion XBr^<2->_4 a secondary one.
- 社団法人日本物理学会の論文
- 1995-01-15
著者
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TANAKA Keisuke
Department of Mathematical and Computing Sciences, Tokyo Institute of Technology
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NISHIHATA Yasuo
Department of Physics,School of Science
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SAWADA Akikatsu
Department of Physics, Okayama University
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Tanaka Keisuke
Department Of Cardiovascular Surgery Nagoya Daini Red Cross Hospital
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Nishihata Y
Department Of Physics Faculty Of Science Okayama University
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Shimada Tomohiro
Department of Physics, Faculty of Science, Okayama University
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Sawada Akikatsu
Department Of Applied Physics Faculty Of Engineering Nagoya University:(present Address)synthetic Cr
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Nishihata Yasuo
Department Of Physics Faculty Of Science Okayama University
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Shimada Tomohiro
Department Of Physics Faculty Of Science Okayama University
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Tanaka Keisuke
Department Of Physics Faculty Of Science Okayama University
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Tanaka Keisuke
Department Of Biochemistry Faculty Of Veterinary Medicine Hokkaido University
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Tanaka Keisuke
Department Of Applied Chemistry Waseda University
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