Composition dependence of diffusion in liquid silver chalcogenides

Abstract The interpenetrating two-fluid model proposed previously to describe the properties of superionic melts has been applied to study the composition dependence of the diffusion coefficient in liquid Ag–Se system. The model predicts the existence of a maximum in the diffusion coefficient at the stoichiometric composition, which is in accord with the result of ionic conductivity measurements. The model suggests that collective electronic excitation is playing an important role in the anomalous transport properties of liquid Ag–Se system.