Role of titanium ions on the optical and thermal properties of zinc borate glass doped with TiO2

摘要

60B(2)O(3)-30Na(2)O-(10-x)ZnO:xTiO(2) (x=0 to 1.0 wt%) glasses have been synthesized by melt-quenching for photonic applications. Small amounts of TiO2 are used to improve the structural and optical properties of borate glasses. The produced glass samples are characterized by differential thermal analysis (DTA) and density Measurements. Thermal properties such as the glass transition temperature (T-g), glass crystallization temperature (T-c), glass stability parameters (Delta T), glass melting temperature (T-m), glass forming ability parameters (T-g/T-m) are calculated from DTA thermograms. FT-IR transmittance spectra are used to investigate the structure of glass systems. The optical properties of the glass samples were analyzed by UV-VIS spectroscopy within the wavelength range of 200-900 nm. The indirect band gap (E-opt) and Urbach energy (Delta E) values are found with the help of absorption spectra. Also, the refractive index values are determined by ellipsometry. The molar refraction (R-m), electronic polarizability (alpha(m)), oxide ion polarizability (a(O2-)) and optical basicity (Lambda) are calculated. It is found that these parameters decrease with increasing TiO2 content.