Ion motion in high-temperature solid and liquid silver chalcogenides

The noble metal chalcogenides at the stoichiometric composition M2X (M = Cu ,Ag; X = S,Se,Te) all form superionic phases above room temperature in whic h the noble metal ion is able to rapidly diffuse in a either a FCC or BCC c halcogenide lattice. Quasielastic neutron scattering experiments have been performed on Ag2Te in both the solid and liquid phases to measure the diffu sion of the Ag+ ions. A preliminary analysis of the results is compared wit h previous measurements on Ag2Se. (C) 2000 Elsevier Science B.V. All rights reserved.