Abstract
When more than one kind of mobile ions are mixed in ionic conducting glasses, crystals and melts, there is non-linear decrease of conductivity or diffusivity, which can be as large as several orders of magnitude compared with the transport coefficient of either kind of ions. What is a cause of such a large effect? The phenomenon is known as mixed mobile ion effect or Mixed Alkali Effect (MAE) [1–4]. MAE is also known as common properties for ionic conductors including fast ion conductors such as β”-aluminum systems [5] and is considered as a key feature of the common physics governing the dynamics. Molecular dynamics simulation is useful to study the complex ion dynamics giving rise to the MAE in ionically conducting glasses. Many researchers tackled this problem for a long time and it was called as “permanent challenge” [6] during nearly over one century. The problem is still unsolved in the sense that “ a common view among researchers has not established yet”, although many features have become clearer in recent years. The experimental aspects of MAE are covered in details in Sect. 4.8. The difficulty of the problem is to solve all the following properties and features consistently.
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Habasaki, J., León, C., Ngai, K.L. (2017). The Mixed Alkali Effect Examined by Molecular Dynamics Simulations. In: Dynamics of Glassy, Crystalline and Liquid Ionic Conductors. Topics in Applied Physics, vol 132. Springer, Cham. https://doi.org/10.1007/978-3-319-42391-3_10
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