^1H Spin-Lattice Relaxation in a NH_4HSO_4 Single Crystal
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概要
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The proton NMR line width and spin-lattice relaxation times for the NH_4HSO_4 single crystal were studied over a wide temperature range. The proton spin-lattice relaxation time for NH_4HSO_4 has a minimum value, which is attributed to the effect of molecular motion. The ^1H spin-lattice relaxation times occurring in phases I and III are attributed to the same motions of NH_4 ions. The activation energies for the reorientation motions in phases I and III are 0.98 and 4.61 kcal/mol, respectively. In phase II, the activation energy is 5.92 kcal/mol. The large change in the activation energy between phases I and II indicates that the NH_4 groups are affected during this transition; however, the motion of the NH^+_4 ions between phases II and III does not play an important role in the phase change.
- 社団法人日本物理学会の論文
- 2002-09-15
著者
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Park H
Korea Research Institute Of Standards And Science
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Jung Jae
Korea Research Institute Of Standards And Science
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Park Hyun
Korea Research Institute Of Standards & Science Crystallography Group
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Jung Jae
Korea Institute Of Science And Technology
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LIM Ae
Department of Physics, Jeonju University
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Lim Ae
Department Of Physics Jeonju University
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Han Tae
Department Of Semiconductor Systems Engineering School Of Information And Communication Engineering
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Park Hyun
Korea Atomic Energy Research Institute
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Han Tae
Department Of Physics Jeonju University
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