Proton dynamics in Cs2(HSO4)(H2PO4) studied by 1H NMR

被引：20
|
作者：
Hayashi, S [1 ]
Mizuno, M [1 ]
机构：
[1] AIST, Res Inst Instrumentat Frontier, Tsukuba, Ibaraki 3058565, Japan
来源：
SOLID STATE IONICS | 2005年 / 176卷 / 7-8期
关键词：
proton dynamics; proton conduction; inorganic solid acid; nuclear magnetic resonance; NMR; spin-lattice relaxation;
D O I：
10.1016/j.ssi.2004.10.008
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Proton dynamics in Cs-2(HSO4)(H2PO4) has been studied by H-1 NMR. The compound shows a large thermal history. The high-temperature phase (phase HT) is retained for a considerably long period on cooling. The original room-temperature phase (phase RT) does not recover on cooling from phase HT, and another room-temperature phase (phase RT2) is produced. H-1 NMR spectra indicate that reorientation of the SO4/PO4 tetrahedron takes place in phases RT and RT2 and that protons diffuse translationally in phases RT2 and HT. In all the phases, the mean residence time of protons has a distribution, being demonstrated by H-1 spectral line shapes and H-1 spin-lattice relaxation times. Protons diffuse with the inverse of the frequency factor (tau(0)) of 0.90 x 10(-13) s and the activation energy (E-a) of 36 kJ/mol in phase HT, being obtained from analysis of the H-1 spin-lattice relaxation times. These parameters can well explain the macroscopic electric conductivity. Reorientation of the SO4/PO4 tetrahedron limits the proton transport in phase HT as well as in phase RT2. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：745 / 754
页数：10
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