STRUCTURAL ORDERING IN AG-BASED TERNARY CHALCOGENIDE GLASSES

Results obtained by the method of isotopic substitution in neutron dif fraction on the structural ordering in the glassy semiconductor g-(Ag2 Te)(0.5)(As2Te3)(0.5) show that the short-range order of the network f ormer (g-As2Te3) is retained and the Ag-Ag intermediate-range order is similar to that of the crystalline network modifier (c-Ag2Te). By com parison with results for the glassy fast-ion conductor g-(Ag2Se)(0.25) (AsSe)(0.75) it is concluded that silver nearest-neighbour interaction s are responsible for the absence of cationic motion.