The density fluctuations contributing to light scattering in a glass are governed by the flctive temperature of the glass and the equilibrium compressibility of the melt. Using ultrasonic velocity data for K 2 O–SiO 2 melts, these compressibilities were evaluated, and the magnitude of the density fluctuations were calculated. In this system, the mean–square amplitude of the fluctuations reaches a minimum value (about half that of pure SiO 2 ) for a composition of ∼20 mol% K 2 O. By extrapolating the equilibrium compressibilities to zero K 2 O content, the density fluctuations can be calculated for pure SiO 2 glass; this calculation agrees well with the result obtained from light–scattering measurements.
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Laberge et al. (1973) studied this question.
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