Measurements of low temperature specific heat Cp (1.5 K-25 K) have been carried out in AgI-Ag2O-B2O3 superionic glasses. It has been revealed that modifications of the network coherence change the magnitude of the hump in the specific heat, which is observed when it is plotted as Cp/T3: the increasing connectivity (defined as the number of bridging bonds per network forming ion) reduces the deviations of Cp from a T3 behavior. Finally comparative measurements of low temperature Cp and low frequency Raman scattering (below 100 cm-1) in the same glass permit us to assess the frequency dependence of the photon-vibration coupling coefficient C(?) and the spectral density of low-energy vibrational modes g(?).
Low energy vibrations in superionic glasses
A Bartolotta;
1998
Abstract
Measurements of low temperature specific heat Cp (1.5 K-25 K) have been carried out in AgI-Ag2O-B2O3 superionic glasses. It has been revealed that modifications of the network coherence change the magnitude of the hump in the specific heat, which is observed when it is plotted as Cp/T3: the increasing connectivity (defined as the number of bridging bonds per network forming ion) reduces the deviations of Cp from a T3 behavior. Finally comparative measurements of low temperature Cp and low frequency Raman scattering (below 100 cm-1) in the same glass permit us to assess the frequency dependence of the photon-vibration coupling coefficient C(?) and the spectral density of low-energy vibrational modes g(?).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
