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Anisotropic Ion Diffusion
An anisotropic ion diffusion process is developed, as reported by Masaya Fujioka and co‐workers in article number 2106754. This technique can homogeneously extract Na+ from a type‐II Si clathrate regardless of the size of the single crystal while maintaining high crystallinity, by skillfully exploiting the difference in the chemical potentials as a driving force. The synthesis...
Na‐free Si clathrates consisting only of Si cages are an allotrope of diamond‐structured Si. This material is promising for various device applications, such as next‐generation photovoltaics. The probable technique for synthesizing Na‐free Si clathrates is to extract Na+ from the Si cages of Na24Si136. Vacuum annealing is presently a well‐known conventional and effective approach for extracting Na...
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