Origin of nonexponential relaxation in a crystalline ionic conductor: A multidimensional 109Ag NMR study
Origin of nonexponential relaxation in a crystalline ionic conductor: A multidimensional 109Ag NMR study
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晶体离子导体中非指数弛豫的起源：多维 109Ag NMR 研究
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
A. Heuer
中科院分区：
文献类型：
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作者：
M. Vogel;C. Brinkmann;H. Eckert;A. Heuer
通过比较合适的二次和三次1 0 9 Ag NMR相关函数，分析了晶体离子导体Ag 7 P3 S1 1中银离子非指数弛豫的起源。非指数性是由于速率分布，即，动态异质性，而不是内在的非指数性。因此，数据没有给出相关的来回跳跃的银弛豫的时间尺度上的相关性的证据。此外，四次1 0 9 Ag NMR相关函数表明快和慢银离子之间的交换过程中发生的时间尺度上的银跳跃，因此，动力学的不均匀性是短暂的。
The origin of the nonexponential relaxation of silver ions in the crystalline ion conductor Ag 7 P 3 S 1 1 is analyzed by comparing appropriate two-time and three-time 1 0 9 Ag NMR correlation functions. The nonexponentiality is due to a rate distribution, i.e., dynamic heterogeneities, rather than to an intrinsic nonexponentiality. Thus, the data give no evidence for the relevance of correlated back-and-forth jumps on the time scale of the silver relaxation. Further, four-time 1 0 9 Ag NMR correlation functions indicate exchange processes between fast and slow silver ions that take place on the time scale of the silver jumps and, hence, the dynamical heterogeneities are short lived.