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Phonon-fracton crossover

Courtens E, Lartigue C, Mezei E et al (1990) Measurement of the phonon-fracton crossover in the density of... [Pg.497]

Courtens E., Pelous J., Phalippou J., Vacher R, Woignia- T. Brillouin-scattaing measurements of phonon-fracton crossover in sihca aerogels. Phys. Rev. Lett. 1987 58 128-131 Courtens E., Vacher R., Pelous J., Woignier T. Obsawation offractons in sihca aerogels. Europhys. Lett. 1988 6 245-250... [Pg.798]

The phonon-fracton crossover frequency, C0coi wave vector, q o, are accessible by Brillouin scattering experiments. Spectra can be measured for various sample densities p, and for each p for various momentum exchanges q. Each spectrum is determined by three fitting parameters, namely co oi, qco he absolute intensity. Using the former two, and assuming that mutual self-similarity also extends to dynamical... [Pg.336]

In laboratory experiments, iV(co) is accessible rather directly by incoherent neutronscattering measurements. On silica aerogels, and at low frequencies near the phonon-fracton crossover, one finds 1.3... 1.4,21 a value significantly larger than that of... [Pg.187]

See other pages where Phonon-fracton crossover is mentioned: [Pg.242]    [Pg.324]    [Pg.782]    [Pg.336]    [Pg.176]    [Pg.188]    [Pg.242]    [Pg.324]    [Pg.782]    [Pg.336]    [Pg.176]    [Pg.188]    [Pg.152]    [Pg.241]    [Pg.105]   
See also in sourсe #XX -- [ Pg.187 ]



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