Abstract
After a review of the structural information obtained by room-temperature EXAFS spectroscopy on AgI-containing silver borate glasses, the first temperature-dependent EXAFS measurements on the glass (AgI) 0.55(Ag 2O·4B 2O 3) 0.45 in the range 77–300 K are presented. Low-temperature measurements and a more refined data reduction scheme allow a more accurate determination of the structural parameters. The absence of ordered AgI clusters is confirmed and discussed in terms of different structural models. The temperature dependence of EXAFS Debye-Waller factor of the first coordination shell of iodine allows the separation and evaluation for the first time of the contribution of static and thermal disorder. The thermal contribution is comparable with that of crystalline AgI.
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