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Equilibrium Compressibilities and Density Fluctuations in K 2 O–SiO 2 Glasses
Author(s) -
LABERGE N. L.,
VASILESCU V. V.,
MONTROSE C. J.,
MACEDO P. B.
Publication year - 1973
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1973.tb12398.x
Subject(s) - compressibility , thermodynamics , amplitude , scattering , materials science , light scattering , mineralogy , chemistry , optics , physics
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.