Abstract
In Ag-based superionic melts, medium-range order in the Ag–Ag partial correlation relating to the fast ionic conducting path of Ag ions was analyzed as a function of Ag concentration. High energy x-ray diffraction measurements for molten Ag 2 Se and (Ag 2 Se) x (AgI) 1- x mixtures and (RbI) y (AgI) 1- y were carried out. In molten (Ag 2 Se) x (AgI) 1- x mixtures, a first sharp diffraction peak (FSDP) is not observed in the total structure factor for x = 0.2 and 0.3. On the other hand, molten (RbI) y (AgI) 1- y mixture have a FSDP at small Q region than that of molten AgI. It may suggest that the correlation length of the fluctuation of Ag distribution varies with Ag concentration. In the reverse Monte Carlo analysis for molten Ag 2 Se, it is confirmed that the FSDP of Ag–Ag partial structure factor shifts to short length side compared with molten AgI.
Published Version
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