The evolution of the Raman spectra of the 20MgO·20Al_2O_3·60SiO_2 glass with 10 mol% TiO_2 and glasses doped with 0.5 wt % NiO or 2.5 and 5.0 mol % Ga_2O_3 is investigated in the course of heat treatment resulting in phase separation and crystallization. The composition and structure of the amorphous and crystalline phases (precipitating in the course of phase separation) and the residual glass are analyzed on the basis of Raman scattering, small-angle X-ray scattering (SAXS), and X-ray powder diffraction data. The size of nanoparticles of the precipitated phases is determined by low-frequency Raman spectroscopy, and the results obtained are compared with the nanoparticle size derived from the SAXS data.
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