Effects of MoO3 Addition on Spectroscopic Properties of Lithium Zinc Borate Glass

The paper deals with the spectroscopic properties of Li2O -ZnO-B2O3 glass containing different concentrations of MoO3 (ranging from 1 to 5 mol %) were prepared by melt quenching. Spectroscopic (infrared, optical absorption spectra and ESR) properties of these glasses have been carried out. The Optical absorption Spectrum contains one broad absorption band at 681 nm, this attributed to the excitation of Mo5+ (4d1) ion. ESR studies reveal Molybdenum ions are expected to exist mainly in the Mo6+ state in the glass network. As the concentration of MoO3 is increased, especially beyond 5.0 mol %, the colour of the glasses increased, that indicating the reduction of molybdenum ions from the Mo6+ state to the Mo5+ state. ESR, IR and Optical absorption spectra of paramagnetic ion in the above glasses reveal that the site symmetry of the transition metal ion is elongated octahedral.