Optical and structural properties of ZnO TiO2 and V2O5 modified lithium borate glasses glass ceramics

Abstract

This thesis describes the structural, thermal, optical and dielectric properties of lithium borate glasses and glass-ceramics modified by ZnO, TiO2 and V2O5. The samples are synthesized by melt-quench technique at 1200 °C in re-crystallize Al2O3 crucible. The as prepared samples are characterized using various analytical techniques. The obtained results are correlated with theoretical composition dependent parameters. The present work has been divided into five chapters followed by relevant references. and#61558; Chapter 1 describes the evolution and introduction of glasses and glass-ceramics. The role of different glass components like former, modifier and intermediate oxides and their influences on different properties have also been discussed. Furthermore, different requirements for glass formation have been described. Applications of glasses in modern life have also been summarized and the chapter ends with the motivation behind the study. and#61558; Chapter 2 reviews the literature and give an idea that lithium borate glasses and glass-ceramics are the focus of scientific interest due to their random structures and applications. The presence of transition metal oxides in glass composition modifies the properties of glasses due to variable transition states which formed locally different structural units in glass matrix. For instance, the character of chemical bonds and structural rearrangement occurs in the glass network due to incorporation of vanadyl ion (VO2+), which changes the optical, thermal and dielectric properties of the glasses. On the other hand, small amount of titanium oxide acts as a nucleating agent and it helps in reducing the optical band gap of material. Researchers have also found titanium oxide doped borosilicate glasses are suitable for microelectronic applications. Additionally, these borate glasses are often used as dielectric and insulating shielding materials. Moreover, the wide optical band gap of these glasses can be exploited to use in non-linear optics.