EXAFS on (AgI) _x (Ag₂O n B₂O₃)_1−x Superionic Glasses

Abstract

In the last years the superionic materials have raised a great interest in physicists and chemists for their characteristic property of high ionic condutivity [1]. Most of the new materials which have been used for application as solid electrolytes [2] were crystalline materials in which the structure allows high ionic conductivity. Among superionic conductors, silver iodide is one of the most studied for the motion of conducting ions through the sites: a low potential barrier implies a weak bond between the mobile ion and the reticular structure. Now our interest for ionic compounds is turned to glassy materials. They have the advantage of easiness of preparation in a large range of dimensions. Moreover their composition can be almost continuously changed. For these considerations we have been stimulated to study borate glasses containing silver iodide: in particular (AgI)_x (Ag₂O n B₂O₃)_1−x glasses at various x and n concentrations.