SMALL-ANGLE SCATTERING INVESTIGATION OF PHASE-SEPARATION IN GLASSES INFLUENCED BY ADMIXTURES OF TIO2, MOO3 AND WO3

Two silicate glasses with different compositions have been investigated by combining conventional small-angle X-ray scattering with methods of contrast variation (anomalous dispersion, neutron scattering). It has been shown that in a base glass for glass ceramics TiO2 additives which accelerate the process of phase separation are inhomogeneously distributed in the glass and cover the separating droplet phase. The influence of WO3 and MoO3 on the conditions of the phase separation in a soda-lime-silica glass mainly consists in a shift of the miscibility dome in the phase diagram up to higher temperatures.