Brillouin-scattering measurements of phonon-fracton crossover in silica aerogels
- 12 January 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 58 (2) , 128-131
- https://doi.org/10.1103/physrevlett.58.128
Abstract
Brillouin scattering on porous silica aerogels reveals the onset of the phonon-to-fracton crossover in both the wave-vector and density dependence of the spectra. The results are consistent with a fractal description, giving both the fractal dimension D and the spectral dimension d̃. In the hypothesis that the samples form single infinite clusters, the numerical values suggest that scalar elasticity is significant in these materials.Keywords
This publication has 16 references indexed in Scilit:
- Structure of Random Porous Materials: Silica AerogelPhysical Review Letters, 1986
- Phonon-fracton crossover and scaling of the sound velocityPhysical Review B, 1986
- Measurement of elasticity and conductivity of a three-dimensional percolation systemPhysical Review Letters, 1985
- Raman spectrum and structure of silica aerogelThe Journal of Chemical Physics, 1985
- Scaling approach to phonon-fracton crossoverPhysical Review B, 1985
- Dynamical behavior of fractal structuresPhysical Review B, 1985
- Synthesis of monolithic silica gels by hypercritical solvent evacuationJournal of Materials Science, 1984
- Excitation spectrum for vibrations on a percolating network: Effective-medium approximationPhysical Review B, 1984
- Sol-gel transition in simple silicates IIJournal of Non-Crystalline Solids, 1984
- Fracton interpretation of vibrational properties of cross-linked polymers, glasses, and irradiated quartzPhysical Review B, 1983