Effect of Field Strength and Electronegativity of CaO and MgO on Structural and Optical Properties of SiO2-K2O-CaO-MgO Glasses

The glass composition 55 SiO2-10 K2O-(35-x) CaO-(x) MgO (0 a parts per thousand currency sign x a parts per thousand currency sign 30) is prepared by the melt quenched technique. The as prepared samples are characterized by X-ray diffraction, Fourier Transform-Infrared Spectroscopy (FT-IR) and UV-Visible reflectance spectroscopy. The MgO containing glasses show better polymerization (cross-linking) and have a compact glass network as compared to CaO containing glass. Interestingly, some weak bonds are observed around 1393, 1461 and 1530 cm(-1) in FT-IR spectra related to Ca/Mg-O-H. The optical band gap of the series varies from 3.42 eV to 3.72 eV, indicating wide-band gap materials that could be used in non-linear optical applications.