Type-I clathrate compounds have attracted a great deal of interest in connection with the
search for efficient thermoelectric materials. These compounds constitute networked cages …

We provide detailed background, theoretical and practical, on the specific heat of minerals
and mixtures thereof,'astro-materials,'as well as background information on common …

We show that a vibrational instability of the spectrum of weakly interacting quasilocal
harmonic modes creates the maximum in the inelastic scattering intensity in glasses, the …

This paper describes the progress that has been made in the past decade in the
investigation of the peculiar dynamic properties of vitreous silica (v-SiO 2) and related …

Hyper-Raman spectroscopy is used to investigate low frequency vibrations of various silica
glasses. A strong boson peak is observed. The corresponding modes are inactive in infrared …

The temperature dependence of the frequency dispersion in the sound velocity and
damping of vitreous silica is reanalyzed. Thermally activated relaxation accounts for the …

We studied the effect of densification on the vibrational dynamics of a Na 2 FeSi 3 O 8 glass.
The density of vibrational states (DOS) has been measured using nuclear inelastic …

The linewidth of longitudinal acoustic waves in densified silica glass is obtained by inelastic
x-ray scattering. It increases with a high power α of the frequency up to a crossover where …

The low-frequency Raman coupling coefficient C (ν) of 11 different glasses is evaluated. It is
shown that the coupling coefficient demonstrates a universal linear frequency behavior C …

The low-frequency dynamics in glasses is compared with that in icosahedral quasicrystals.
For both arrangements of matter, the existence of nanometric heterogeneities, implying the …