The glassy system xAgI:(1-x)Ag2O·2B2O3 is characterized by anomalies of several quantities (glass transition temperature, density, molar volume) in the composition region 0.3≤x≤0.4. Here, we interpret these anomalies in the framework of a recent percolation model we proposed to explain the transport properties of AgI-based fast ion conducting glasses. The key point of the model is that the mobility of the silver cations is related to their mixed oxygen-iodine coordination. We show that all the observed anomalies are conveniently explained by considering the transition, interesting both in the short and the medium range, between a composition region where isolated clusters of O-Ag-I sites are present (x<0.3), and a region where fully interconnected pathways of O-Ag-I sites are created (x>0.4)
Mustarelli, P., Tomasi, C., Magistris, A. (2007). A microscopic interpretation of the bulk anomalies in AgI-Ag2O.2B2O3 glasses. PHILOSOPHICAL MAGAZINE, 87(3-5), 787-794 [10.1080/14786430600919336].
A microscopic interpretation of the bulk anomalies in AgI-Ag2O.2B2O3 glasses
Mustarelli Piercarlo
;
2007
Abstract
The glassy system xAgI:(1-x)Ag2O·2B2O3 is characterized by anomalies of several quantities (glass transition temperature, density, molar volume) in the composition region 0.3≤x≤0.4. Here, we interpret these anomalies in the framework of a recent percolation model we proposed to explain the transport properties of AgI-based fast ion conducting glasses. The key point of the model is that the mobility of the silver cations is related to their mixed oxygen-iodine coordination. We show that all the observed anomalies are conveniently explained by considering the transition, interesting both in the short and the medium range, between a composition region where isolated clusters of O-Ag-I sites are present (x<0.3), and a region where fully interconnected pathways of O-Ag-I sites are created (x>0.4)
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
