Design of new type of ion conducting intercalation compound with modification of van der Waals gaps

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In our work with aim of artificially designing new type of cation conductor, intercalation of various guest elements into van der Waals spaces of layer structured compounds has been investigated. The present work has studied doubly intercalation of iodine as bridging anions and silver as conducting cations into Sr-doped Bi_2O_3 (SBO) with van der Waals spaces, and characterized resultant intercalation compounds. Until now, the following results have been obtained in our investigations.・ The doubly intercalation of iodine and silver into SBO can take place in the following stepwise process the iodine elements are first intercalated into the SBO around 440K and then the silver elements are intercalated in the I-intercalated SBO around 570K.・ The doubly intercalation brings about a large expansion around 1 nm in the c axis of host structure. It has been suggested from calculations for one-dimensional electron distribution that the iodine and silver intercalated are located within the van der Waals spaces of host structure.・ The amounts of guest elements intercalated are controllable with the amount of silver added to starting mixture.・ The Ag intercalation makes high conductivities for the new intercalation compounds thus synthesized. The above results indicate that the enhanced electrical properties are due to migration of Ag intercalated.