Light scattering from boron trioxide through the glass transition

Abstract

Light scattering from boron trioxide has been studied as a function of temperature in the melt near the glass transformation temperature and in the solid. Both polarized and depolarized spectra were obtained. At all temperatures (20–516°C) the scattering consists of a polarized contribution associated with density fluctuations and a depolarized component presumably connected with the anisotropic nature of the B2O3 glass network. Quantitative results are presented confirming that the polarized scattering from density fluctuations in the solid is determined by the equilibrium compressibility of the melt at the fictive temperature. It is shown that the anisotropic scattering also appears to be ``frozen-in'' at the fictive temperature.

Origin of Rayleigh scattering and anomaly of elastic properties in vitreous and molten GeO2

“…where I RS VH and I RS VV are Rayleigh scattering intensities measured at parallel and perpendicular polarizations, and relationship for 90°scattering [19]:…”

Electron trapping and hydrogen atoms in oxide glasses

“…46 Subsequent work showed that ''dry'' v-B 2 O 3 is also a strong light scatterer when compared to other glasses. 47 The polarized light scattering is due to density fluctuations while the depolarized scattering is due to low symmetry of network-forming units. It is the anisotropy of planar BO 3 and B 3 O 6 groups ͑as compared to tetrahedral BO 4 Ϫ and SiO 4 groups͒ which makes v-B 2 O 3 to scatter light Ϸ10 times stronger than other oxide glasses.…”

Effect of fragility on relaxation of density fluctuations in glass

“…These fluctuations are responsible for optical scattering [1][2][3] and are a major contributor to spatially heterogeneous dynamics in glass and glass-forming liquids [4][5][6][7]. The magnitude of density fluctuations is known to be dependent on the thermal history of the glass [6,[8][9][10][11] as quantified through its fictive temperature [12].…”