The paper presents a study on obtaining and characterization of silicate glasses from the oxide systems: R₂O (R: Na, K) – R’O (R': Ca, Mg, Zn) – ZrO₂ - SiO₂. A supplementary amount of titanium oxide was added, in order to improve the refractive index, average dispersion and Abbe coefficient of the final glass. These oxide systems are investigated aiming to replace the conventional lead crystal glass, where harmful compounds as PbO and BaO are replaced by ZrO₂ and TiO₂. Ware glass, stained glass, decorative products and technical applications are the main uses of these vitreous materials.

The samples were optical and structural characterized by UV-VIS, FTIR and Raman spectroscopy. FTIR transmission spectra in the range 4000-400 cm^-1, put in evidence ZnO₄, ZnO₆, TiO₄, TiO₆, ZrO₆, SiO₄ groups as well as Si-O-Ti and Ti-O-Ti groups. This confirms that TiO₂ is a network former together with SiO₂, providing a mixed oxide network.

Raman spectra of TiO₂-containing glass samples show vibration peaks characteristic for silicon oxide and new ones, attributed to Si-O-Ti bonds. The samples containing ZrO₂, reveal a shift of TiO₂ Raman peaks to low energy, which also reveals the formation of Zr-O-Ti vitreous mixed network.

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