Abstract
The dynamic properties of mobile Ag ions in the superionic conductor Ag 2 Se are studied by ab initio molecular-dynamics simulations. The population analysis including the gross charge and the overlap population shows that the bonding properties of Ag ions change accompanied with the diffusive motion. By investigating the displacement-correlation functions between Ag ions, it is clarified that Ag ions exhibit a collective motion with their neighbor Ag ions when they migrate between neighboring tetrahedral sites.
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