Features of the anomalous scattering of light in two-phase sodium borosilicate glass

Abstract

This paper is devoted to the study of light scattering in inhomogeneous glasses. The spectral behavior of the extinction coefficient of the initial sodium borosilicate glass and two glasses obtained by heat treatment is experimentally studied. It is established that the extinction coefficient of heat-treated glasses in the visible region is determined by the scattering of light. Experimental data on the anomalous spectral dependence of the extinction coefficient of the glass subjected to more prolonged heat treatment are compared with the results of calculations carried out in terms of various scattering models based on literature data on the structure of this glass, which consists of liquation spherical particles in a matrix. It is shown that the ordering effects observed earlier in the relative position of the particles play an important role in the light scattering. It is pointed out that, to theoretically describe the scattering properties of a system of polydisperse particles, it is necessary to know the pairwise correlation function of the particles, which depends on the size of the particles in the pair.

A Simple Method for Estimation of the Scattering Exponent of Nanostructured Glasses

“…The particles in the model [ 23 , 24 ] are assumed to be spherical, and the results of simulation can be strictly applied only to some special cases, such as, for example, the glass G2 ( Section 2.2.1 ) with spherical particles [ 25 ]. The experimental value of the scattering exponent for this glass ([ 26 ] and Section 2.2.1 of the present paper, Equations (15) and (16)), , is close to simulated one, .…”

“…In Ref. [ 26 ], the extinction coefficient of the phase-separated sodium borosilicate glass denoted G2 was studied by the first method using measured spectra of optical density for two samples of different thicknesses and Equation (5).…”

Anomalies in light scattering by glass–ceramics of the zinc aluminum silicate system, caused by low nickel oxide doping

“…It is doubtful whether this assumption is valid for particles in glasses, and, to actually take the polydisperseness of particles in glasses into account when solving the scattering problem, it is necessary to know how the pairwise correlation function of the particles depends on the size of the particles in a pair. 7 There are no data of this type, either theoretical or experimental, and it remains unclear to what extent the polydisperseness affects the interference effects. In the most general case, instead of polydisperseness, it is possible to speak of the different scattering properties of the particles, caused not only by a size difference, but also by differences in the refractive indices and the shape of the particles.…”

“…This phenomenon, known as anomalous light scattering, can be observed not only in phaseseparated glasses (see, for example, Andreev's review article 6 and the recently published Ref. 7), but also in GCMs. [8][9][10] At the early stages of phase transformations, anomalous scattering can be caused by the presence of diffusion zones around growing particles, which suppress the dipole component in the scattering (see the reviews in Refs.…”

“…16,17 However, it remains unclear how the polydisperseness of the particles affects the anomalous scattering. 7 The most complex light-scattering pattern in glass-based materials is observed in GCMs. This is because several crystalline and amorphous phases with different refractive indices can precipitate, with the shape, size distribution, and relative position of the particles varying within wide limits, depending on the composition and conditions under which the material is produced.…”