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http://dx.doi.org/10.6564/JKMRS.2010.14.1.018

^1H NMR Relaxation Study of Molecular Motion in the Paraelectric Phase of (NH4)2Cd2(SO4)3 Single Crystals  

Lim, Ae-Ran (Department of Science Education, Jeonju University)
Jung, Won-Ki (School of Electrical Engineering Jeonju University)
Publication Information
Journal of the Korean Magnetic Resonance Society / v.14, no.1, 2010 , pp. 18-27 More about this Journal
Abstract
The NMR spectrum and spin-lattice relaxation times, $T_1$, of the $^{1}H$ nuclei in $(NH_{4})_{2}Cd_{2}(SO_{4})_{3}$ single crystals were obtained. The two minima in $T_1$ in the paraelectric phase are attributed to the reorientational motions of the $NH_{4}^{+}$ groups. The $^{1}H\;T_1$ of the $(NH_{4})_{2}Cd_{2}(SO_{4})_{3}$ crystals can be described with Bloembergen- Purcell-Pound (BPP) theory. The experimental value of $T_1$ can be expressed in terms of an isotropic correlation time ${\tau}_H$ for molecular motions by using the BPP theory, and determine the role of protons in these processes.
Keywords
$(NH_{4})_{2}Cd_{2}(SO_{4})_{3}$; Ferroelectrics; Crystal growth; Nuclear magnetic resonance; Spin-lattice relaxation; Molecular motion;
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Times Cited By KSCI : 2  (Citation Analysis)
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