The results for the refractive indices of undoped and Nd- and Ce-doped glasses of <$Eroman {CaO~-~Ga sub 2 O sub 3 ~-~GeO sub 2 }>system are obtained and analyzed. The glasses with the garnet <$Eroman {Ca sub 3 Ga sub 2 O sub 3 ~-~O sub 12 }> and Ca-gallogermanate <$Eroman {Ca sub 3 Ga sub 2 Ge sub 4 O sub 14 }> compositions have been obtained by high-temperature synthesis. Nd and Ce impurities have been added to the garnet-composition glass as <$Eroman {Nd sub 2 O sub 3 }> and <$Eroman {Ce sub 2 O sub 3 }> oxides in the amounts of 0.2 and 0.7 wt. %, respectively. The refractive indices of the glasses depend on the basic glass composition. In particular, the refractive index increases with increasing Ge content. The presence of Nd and Ce impurities in the garnet-composition glasses in the amounts larger than 0.1 wt. % gives rise to essential increase of the refractive indices. The average refractive indices for the glasses with <$Eroman {Ca sub 3 Ga sub 2 Ge sub 4 O sub 14 }> composition are considerably smaller than those of the corresponding crystals with the garnet and Ca-gallogermanate structure. Significant deviations of the refractive index measured in different parts of <$Eroman {Ca sub 3 Ga sub 2 O sub 3 ~-~O sub 12 }> garnet crystal can be related to inhomogeneous distribution of Ge.

• Падляк Богдан Володимирович (1956–) (фізико-математичні науки)

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