The behavior of acoustic attenuation in (AgI)x(Ag2O·2B2O3)1−x, where the molar fraction x varies from 0 to 0.6, was measured in the temperature range 80 to 470K and at ultrasonic frequencies (5 to 45 Mhz). The presence of a broad peak, whose position shifts to higher temperatures with increasing frequency and whose height increases with AgI concentration, indicates the existence of thermally activated relaxation processes due to mobile Ag+ ions. A quantitative analysis in terms of a relaxation time distribution, coming from a Gaussian-like distribution function for the activation energies E, gave a good fit of the experimental data. All the results are discussed in connection with the possible microscopic structure of those glasses.
Internal friction due to mobile ions (AgI)x(Ag20-B2O3)1-x superionic glasses
CARINI, Giuseppe;CUTRONI, Maria;GALLI, Giovanni;FEDERICO, Mauro;TRIPODO, Gaspare
1983-01-01
Abstract
The behavior of acoustic attenuation in (AgI)x(Ag2O·2B2O3)1−x, where the molar fraction x varies from 0 to 0.6, was measured in the temperature range 80 to 470K and at ultrasonic frequencies (5 to 45 Mhz). The presence of a broad peak, whose position shifts to higher temperatures with increasing frequency and whose height increases with AgI concentration, indicates the existence of thermally activated relaxation processes due to mobile Ag+ ions. A quantitative analysis in terms of a relaxation time distribution, coming from a Gaussian-like distribution function for the activation energies E, gave a good fit of the experimental data. All the results are discussed in connection with the possible microscopic structure of those glasses.Pubblicazioni consigliate
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