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Structural correlations in the ac conductivity of ion-containing glasses

机译:含离子玻璃的交流电导率的结构相关性

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The power law dispersion of the conductivity in most ion-containing oxide glasses appears to be universal. This universality indicates that no correspondence exists between the degree of non-Debye behavior and the microscopic structure of a glass host. Despite its universal frequency dependence, we demonstrate how the ac conductivity defines a special length scale, L, that represents average diffusional displacement of an ion per activated jump and which can be correlated to properties of the glass host. We compare this length scale to the inter-ionic spacing and demonstrate how both increase with decreasing ion concentration. Although there is much evidence for universality, we suggest that the conductivity exponent may in fact be influenced by the 'dimensionality' of the conduction process. (C) 1997 Elsevier Science B.V.
机译:在大多数含离子的氧化物玻璃中,电导率的幂律分散似乎是普遍的。这种普遍性表明非德拜行为的程度与玻璃基质的微观结构之间不存在对应关系。尽管它具有普遍的频率依赖性,但我们证明了交流电导率如何定义特殊的长度标度L,该长度标度表示每个激活跃迁的离子的平均扩散位移,并且可以与玻璃基质的性能相关。我们将该长度尺度与离子间的间距进行比较,并证明两者均随着离子浓度的降低而增加。尽管有很多通用性的证据,但我们建议电导率指数实际上可能受导电过程的“维数”影响。 (C)1997年Elsevier Science B.V.

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