Evidence of multisite exchange in AgI-AgPO3 glasses:: 109Ag NMR hole-burning spectra

被引：12

作者：

Kawamura, J ^{[1
]}

Kuwata, N

Nakamura, Y

Erata, T

Hattori, T

机构：

[1] Tohoku Univ, Inst Mulitdisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan

[2] Hokkaido Univ, Grad Sch Sci, Sapporo, Hokkaido 0600810, Japan

[3] Osaka Prefecture Univ, Fac Engn, Sakai, Osaka 5938531, Japan

[4] Univ Montpellier 2, CNRS, LPMC, UMR 5617, F-34095 Montpellier 5, France

[5] Hokkaido Univ, Grad Sch Engn, Sapporo, Hokkaido 0600812, Japan

来源：

SOLID STATE IONICS | 2002年 / 154卷

关键词：

superionic conductor glass; structural inhomogeneity; Ag-109; NMR; NMR hole-burning; multisite exchange model;

D O I：

10.1016/S0167-2738(02)00426-5

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：

A narrow Ag-109 NMR spectrum of superionic conductor glass containing AgI exhibits strong broadening at low temperature or at low concentration of AgI. This broadening of the spectrum is attributed to the inhomogeneity of the local structure around Ag+ ions in the glass. The temperature and composition dependence of the spectra can be well explained by a multisite exchange (MSE) model. The existence of the local inhomogeneity and the exchange of Ag+ ions among them can be detected by site-selective hole-burning NMR technique. In this paper, the first measurement of the NMR hole-burning spectra of a superionic conductor glass of AgI-AgPO3 is reported. A clear hole is observed below -20 degreesC, which diffuses to the higher-frequency region corresponding to AgI-rich sites, where the exchange rate is faster. This technique is very useful to investigate site exchange of ions in disordered systems. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：183 / 188

页数：6