Abstract
Several experimental techniques are used to study the short range order, the dynamics and the glass transition in AgIAg 2B 2O 3 compounds. Addition of Ag 2O to B 2O 3, up to [Ag 2O]/[B 2O 3] ⩽0.5 modifies the borate network by creating a BO 4 unit for each silver added. Addition of AgI decreases the glass transition temperature ( T g) but has only minor effects on the short range structure of the borate network. Silver iodide is partially accomodated in the interstices of the glass network. The relationship among a tentative structural picture, the ion transport phenomena and the low temperature dynamics are discussed. An investigation of the dynamics in the AgI·Ag 2O·2B 2O 3 glass near and above T g is presented. With NMR techniques, we monitor the onset of tumbling of the borate units and the dynamical effects of crystallization and/or aging of the glass. Hysteresis effects in the ionic conductivity (σ) temperature dependence and the non-Arrhenian behavior of σT near T g are interpreted in terms of structural modifications occurring at elevated temperatures in the glass.
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