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Elastic properties of silica xerogels and sintered aerogels of densities from ρ=0.5 g/cm 3 to 2.2 g/cm 3 were investigated by Brillouin light scattering. Sound velocities and acoustic attenuation at hypersonic frequencies was measured as a function of density. The elastic modulus C follows a scaling power law C=ρ α with α=3.3±0.1 and confirms previous data at low frequencies...
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