Ag K-edge EXAFS of organic-inorganic mixed ionic conductor glasses of AgI-alkylammonium iodides were measured by varying their compositions. Although their conductivity varies from superionic conductors to insulators through a percolation threshold, no significant change was seen in local structure around mobile Ag+ ions. From a cumulant analysis of the EXAFS data, the nearest neighbor distance between Ag+ and I- is estimated to be 2.79 angstroms and the coordination number is 4.5±0.5 irrespective of the compositions. From these results, it is concluded that the transition from superionic conductor to insulator is not due to the change in local structures but by their intermediate range structure such as connectivity of percolation networks.
|Number of pages||5|
|Journal||Solid State Ionics|
|Publication status||Published - 1999 Jun|
|Event||Proceedings of the 1997 11th International Conference on Solid State Ionics, SSI-97 - Honolulu, HI, USA|
Duration: 1997 Nov 16 → 1997 Nov 21