Rayleigh and Brillouin Scattering in K2O–SiO2 Glasses
- 1 October 1973
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 56 (10) , 510-514
- https://doi.org/10.1111/j.1151-2916.1973.tb12399.x
Abstract
The intensity and spectral distribution of light scattered by K2O‐SiO2 glasses (K2O content up to 40 mol%) were measured. The transverse and longitudinal sound‐wave velocities and the photoelastic constants were evaluated from the results. The total intensity of the scattering (and therefore the attenuation caused by it) exhibited a minimum at a concentration of ∼25 mol% K2O. For this composition the attenuation is ∼2/2 of that in pure SiO2. This behavior results from the existence of anomalously small concentration fluctuations in the melt of K2O·3SiO2 glass. A qualitative explanation of this result, involving low‐temperature immiscibility regions, is presented.Keywords
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