Effects of MoO<SUB>3</SUB> Addition on Spectroscopic Properties of Lithium Zinc Borate Glass

Abstract

The paper deals with the spectroscopic properties of Li 2 O -ZnO-B 2 O 3 glass containing different concentrations of MoO 3 (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 Mo 5+ (4d 1 ) ion. ESR studies reveal Molybdenum ions are expected to exist mainly in the Mo 6+ state in the glass network. As the concentration of MoO 3 is increased, especially beyond 5.0 mol %, the colour of the glasses increased, that indicating the reduction of molybdenum ions from the Mo 6+ state to the Mo 5+ 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.