Abstract
The local environment around iodine has been studied as a function of temperature by extended X-ray absorption fine structure (EXAFS) in fast-ion-conducting AgI doped glasses (borate and molybdate): silver borate glass (AgI)0.55(Ag2O:4·B2O3)0.45 has been investigated from 39 to 298 K, and silver molybdate glasses (AgI) x (Ag2MoO4)1−x , with x = .67 and x = 0.75, from 25 K to T g (330–350 K). In spite of the very different character of their host matrices, these two families of glasses display a very similar local thermal behaviour around iodine: the mean distance and the coordination number of the short-range I-Ag distribution decrease when the temperature increases. These experimental results can be related to the temperature dependence of the diffusion of the silver ions, giving new elements to better understand the mechanism of ionic conduction.
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