An experimental study of the sound velocity in AgI-Ag2O-B2O3 superionic glassy systems is presented. Measurements were performed at 5 MHz and in the (77–450)-K temperature range as a function of AgI concentration. The ultrasonic velocity behavior is explained in terms of two physical contributions: The first is due to thermally activated relaxation processes; the second one, to anharmonic effects. Moreover, the analysis of the room-temperature elastic moduli, at increasing concentrations of AgI, seems to give further evidence for the structural hypothesis of a glassy network formed from a matrix of silver borate, in which weakly bonded microdomains of silver iodide are dispersed.
Relaxation and anharmonic contributions to sound velocity behaviour in superionic glasses
CARINI, Giuseppe;CUTRONI, Maria;FEDERICO, Mauro;TRIPODO, Gaspare
1985-01-01
Abstract
An experimental study of the sound velocity in AgI-Ag2O-B2O3 superionic glassy systems is presented. Measurements were performed at 5 MHz and in the (77–450)-K temperature range as a function of AgI concentration. The ultrasonic velocity behavior is explained in terms of two physical contributions: The first is due to thermally activated relaxation processes; the second one, to anharmonic effects. Moreover, the analysis of the room-temperature elastic moduli, at increasing concentrations of AgI, seems to give further evidence for the structural hypothesis of a glassy network formed from a matrix of silver borate, in which weakly bonded microdomains of silver iodide are dispersed.Pubblicazioni consigliate
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