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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >A revised view on the mixed-alkali effect in alkali borate glasses
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A revised view on the mixed-alkali effect in alkali borate glasses

机译：硼酸碱玻璃中混合碱效应的修正观点

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摘要

The mixed-alkali effect (MAE) of the ionic conductivity is traditionally defined as a negative deviation of the dc conductivity from that of an 'ideal glass' obtained according a linear mixing rule. An alternative definition is proposed in this paper which relates the conductivity of a mixed-alkali glass to the conductivity-sum of two single-alkali glasses with total alkali concentrations equal to the corresponding partial alkali concentrations of the mixed-alkali glass. A new reference glass denoted as independent component glass (ICG) is introduced. In contrast to the 'ideal glass' the conductivity of a real mixed-alkali glass is larger than the conductivity of the respective ICG resulting in a positive MAE. This fact manifests an enhancement of the conductivity when two single-alkali glasses are combined to a mixed-alkali glass. The conductivities and the tracer diffusivities of the mixed-alkali- and the corresponding single-alkali glasses are compared from this point of view. A subnetwork diffusion concept (SDC) is proposed to describe the diffusion dynamics in Na-Rb-borate mixed-alkali glasses. (c) 2006 Elsevier B.V. All rights reserved.
机译：传统上，将离子电导率的混合碱效应（MAE）定义为dc电导率与根据线性混合规则获得的“理想玻璃”的dc电导率的负偏差。本文提出了另一种定义，将混合碱玻璃的电导率与两个总碱浓度等于混合碱玻璃的相应部分碱浓度的单碱玻璃的电导率和相联系。引入了一种称为独立成分玻璃（ICG）的新型参考玻璃。与“理想玻璃”相反，真正的混合碱玻璃的电导率大于相应ICG的电导率，从而产生正MAE。当将两个单碱玻璃组合成混合碱玻璃时，这一事实表明电导率提高。从这个角度比较了混合碱玻璃和相应的单碱玻璃的电导率和示踪扩散率。提出了子网扩散概念（SDC）来描述Na-Rb-硼酸盐混合碱玻璃中的扩散动力学。 （c）2006 Elsevier B.V.保留所有权利。

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