Four types of structures of superionic conductors

Crystal structures of superionic crystals have been analyzed and classified into four groups. The structures of group I do not substantially differ fr om the structures of the majority of ionic crystals. Structures of group II are characterized by frameworks containing channels filled with mobile ion s. Structures of group III are characterized by alternating nonconducting b locks and conducting planes. Structures of group IV are characterized by tw o superlattices-that of mobile ions and that of immobile counterions. It is assumed that group II is the most promising one recommended for the search for new superionics.