were studied and the regions of glassy-state stability are determined. The regular effects of titanium, lanthanum, and barium oxides on the crystallizability of the experimental glasses and on the optical and thermal properties were established. An optical glass with refractive index 1.81, average dispersion 0.0187, and CLTE 76.8´10 -7 K -1 was obtained. This glass can be recommended for high refractive-index optical lenses as well as for the light-guiding core in optical fibers.

on the temperature curve of the viscosity in the 10 10 -10 4 Pa × sec range were established. The important effect of phase separation processes -liquation and crystallizationon the viscosity indexes in the temperature region of the transition from the plastic to the liquid state was demonstrated.

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