Physical characterization of Titania modified sodium borate glasses

Sodium borate glasses modified with TiO2 were prepared and investigated with UV spectroscopy and DTA. The results indicated some structural modification of the borate network as the TiO2 content increases. The UV transmission decreases while the UV absorption increases, which increases the refractive index and the optical energy band gap. Also, the detected bulk modulus along with the T-g decrease. Introducing TiO2 in the glass network resulted in an increase in coordination number of the glass, so the concentration of its basic structural unit TiO6 units will increase resulting in the creation of more NBOs. This process was attributed to the increase of the density, the third-order nonlinear optical susceptibility (chi((3))) and the fragility of the glasses which decreased the rigidity.