Abstract
Sound velocities of Na2FeSi3O8.5 glass have been measured to 12 GPa by Brillouin spectroscopy. Poisson's ratio and bulk, shear, and Young's moduli are calculated as a function of pressure. The shear and Young's moduli and Poisson's ratio show a shift in the response to compression of the glass at ∼2.2 GPa, where the pressure dependence of the shear modulus reverses sign. This shift mirrors those of a wide suite of glasses, and further demonstrates that pressure-induced shear velocity minima are general phenomena in silicate glasses containing few network modifiers. Raman spectra have also been collected of the glass up to 6.5 GPa. A relation is proposed between the magnitude of shear velocity depression observed under pressure in silicate glasses and the ratio of the number of network-modifying cations and network-forming cations. This relation can prospectively be deployed to compositionally tailor the pressure dependence of the elastic velocities of silicate glasses.
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