The nanostructure and optical spectra of magnesium aluminosilicate glass-ceramics containing titanium dioxide nucleation sites for bulk crystallization were studied. It is shown that, on the basis of information on the nanostructure, it is impossible to theoretically describe the nature of the observed light scattering within the framework of the usual concepts of light scattering by nanostructured glass-ceramic materials. It is suggested that the predominant cause of scattering in the studied materials is the microheterogeneity of the structure. (C) 2018 Optical Society of America
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