Proton dynamics in phase II of CsHSO4 as probed by 1H spin-lattice relaxation

被引：31

作者：

Hayashi, S ^{[1
]}

Mizuno, M ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Res Inst Instrumentat Frontier, Tsukuba, Ibaraki 3058565, Japan

来源：

SOLID STATE COMMUNICATIONS | 2004年 / 132卷 / 07期

关键词：

CsHSO4; proton dynamics; NMR;

D O I：

10.1016/j.ssc.2004.08.026

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Proton dynamics in phase 11 of CsHSO4 have been studied by means of H-1 spin-lattice relaxation. The mechanism of the H-1 spin-lattice relaxation in phase 11 has been discussed from temperature and field dependences of the relaxation time. Chemical shift anisotropy is suggested to contribute to the relaxation in addition to dipole-dipole interactions between 1H spins and between H-1 and Cs-133 spins. Motions faster than the SO4 reorientation are proposed for phase 11; a proton transfer between two SO4 tetrahedra along a hydrogen bond and a local motion of Cs+ ions, and their mean residence times are estimated. The H-1 chemical shifts determined from MAS NMR spectra demonstrate that the hydrogen-bond strength is stronger in phases III than in phase II. This leads to the rigid nature of phase III compared with phase If. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：443 / 448

页数：6

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