ESR Study of NH^+_3 and SeO^-_3 Radicals in (NH_4)_2SO_4
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概要
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Ferroelectric phase transition of ammonium sulfate containing a small amunt of ammonium selenate was studied by means of ESR. All the lines of the radicals, NH^+_3 and SeO^-_3, split discontinuously at the transition temperature (T_c). The analysis of NH^+_3 spectra showed that the radical rapidly jumped among two equivalent configurations above T_c, while it mainly stayed one of them below T_c. This fact indicates that the NH^+_4 ion in (NH_4)_2SO_4 undergoes an order-disorder type of transition. Two different species of NH^+_3 which were respectively located at the non-equivalent sites of NH^+_4 showed very different temperature dependences below T_c. Furthermore the analysis of SeO^-_3 spectra indicated that SeO^<2->_4 tetrahedron deformed below T_c. These facts support the proposal by Unruh that there are two or more kinds of dipoles which have different temperature dependence.
- 社団法人日本物理学会の論文
- 1976-12-15
著者
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SUZUKI Ikuo
Department of Electronics,Nagoya Institute of Technology
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ABE RYUJI
Department of Surgery, Kitakyushu Municipal Medical Center
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Suzuki Ikuo
Department Of Applied Physics Faculty Of Engineering Nagoya University
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Shibata Noriyoshi
Department Of Applied Physics Faculty Of Engineering Nagoya University
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Abe Ryuji
Department Fo Applied Physics Faculty Of Engineering Nagoya University
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