Brillouin Scattering in Alkali Metaphosphate Glasses and Melts
We report the results of Brillouin scattering measurements performed on a series of alkali metaphosphate glasses and melts including the mixed alkali composition. Using independent viscosity data, we have applied a time- temperature superposition approach to obtain from the relevant features of the Brillouin spectra the relaxation characteristics of the complex longitudinal elastic modulus. A mixed alkali effect is evidenced in the Brillouin scattering which occurs in the gigahertz range. We find a relaxation process that can be described by a Kohlrausch function with β ≃ 0.30 for single alkali compositions, but is narrower (β ≃ 0.40) at the mixed alkali composition.
D. L. Sidebottom et al., "Brillouin Scattering in Alkali Metaphosphate Glasses and Melts," Journal of Molecular Structure, Elsevier, Jan 1999.
The definitive version is available at http://dx.doi.org/10.1016/S0022-2860(98)00872-2
Materials Science and Engineering
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