Ion transport in glass: Influence of glassy structure on spatial extent of nonrandom ion hopping
Ion transport in glass: Influence of glassy structure on spatial extent of nonrandom ion hopping
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玻璃中的离子传输：玻璃结构对非随机离子跳跃空间范围的影响
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
S. Brückner
中科院分区：
文献类型：
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作者：
B. Roling;C. Martiny;S. Brückner
在短时间尺度上，玻璃中移动的离子的扩散是非随机的，即，离子执行相关的向前-向后运动。通过使用线性响应理论，我们详细展示了如何典型的距离表征的非随机离子扩散的空间范围可以从频率依赖的电导率数据时，黑文比是已知的。我们比较了这些典型的距离的依赖锗酸盐，硼酸盐和硅酸盐玻璃中的碱含量。在所有玻璃中，典型的距离随着碱金属氧化物含量的增加而减小。然而，在锗酸盐和硅酸盐玻璃中，这种减少比硼酸盐中更明显。这种网络前效应指向网络结构对非随机扩散空间范围的影响。
On short time scales, the diffusion of mobile ions in glasses is nonrandom, i.e., the ions perform correlated forward-backward motions. By using linear response theory, we show in detail how typical distances characterizing the spatial extent of the nonrandom ionic diffusion can be derived from frequency-dependent conductivity data when the Haven ratio is known. We compare the dependence of these typical distances on the alkali content in germanate, borate, and silicate glasses. In all glasses, the typical distances decrease with increasing alkali oxide content. In the germanate and silicate glasses, the decrease is, however, more pronounced than in the borates. This network former effect points to the influence of the network structure on the spatial extent of the nonrandom diffusion.