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

摘要

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.