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Static and dynamic structures of superionic melts of noble-metal salts

Kawakita, Yukinobu  ; Tahara, Shuta*

There are many superionic conductors among Ag- and Cu-based compounds where Ag or Cu ions migrate into interstices of crystalline lattice. Mobile ions usually show large fluctuations in their distribution which easily exceed unit cell. Even in the molten state, we found that Ag-Ag (Cu-Cu) partial structure shows nano-order fluctuation. Quasi-elastic neutron scattering of molten CuI and the following mode distribution analysis revealed that there exist three kinds of relaxation mode which are slow diffusion of I, ten times faster diffusion of Cu and very quick local vibrational mode of Cu in a cage formed by surrounding I ions. Molecular dynamic simulation with polarizable ion model also confirms that Cu shows two types of motion. We will discuss how the nano-order fluctuations in Ag (Cu) distribution relate to the emergence of superionic phase.

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