Measurements of low temperature specific heat C p (1.5 K-25 K) have been carried out in AgI-Ag 2 O-B 2 O 3 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 C p /T 3 : the increasing connectivity (defined as the number of bridging bonds per network forming ion) reduces the deviations of C p from a T 3 behavior. Finally comparative measurements of low temperature C p 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(ω) and the spectral density of low-energy vibrational modes g(ω).

Low-energy vibrations in superionic glasses

CARINI, Giuseppe;D'ANGELO, Giovanna;TRIPODO, Gaspare
1998-01-01

Abstract

Measurements of low temperature specific heat C p (1.5 K-25 K) have been carried out in AgI-Ag 2 O-B 2 O 3 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 C p /T 3 : the increasing connectivity (defined as the number of bridging bonds per network forming ion) reduces the deviations of C p from a T 3 behavior. Finally comparative measurements of low temperature C p 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(ω) and the spectral density of low-energy vibrational modes g(ω).
1998
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/1833820
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