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Phys Rev Lett. 2009 May 15;102(19):195502. Epub 2009 May 13.

Connection between Boson peak and elastic properties in silicate glasses.

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  • 1INFM-CNR CRS-SOFT Operative Group in Grenoble c/o E.S.R.F., BP220, 38043 Grenoble, France. giacomo.baldi@esrf.fr


Inelastic neutron, light, and x-ray scattering are used to investigate the vibrational density of states (VDOS) and the elastic properties of a sodium silicate glass as a function of temperature. The elastic moduli show the frequency and temperature dependence typical of anharmonic effects. The measured VDOS spectra, up to and including the excess vibrational density at the boson peak, scale with the Debye level only if this is calculated from the high-frequency values of the elastic constants. This emphasizes that conclusions on the relation between VDOS and elastic properties can be drawn only if anharmonic and relaxational effects are properly taken into account.

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