Spectroscopic study of molybdenum-containing glass structure

The structure of molybdenum-containing cadmium-aluminoborate glasses was studied using IR spectroscopy, Raman scattering and electronic paramagnetic resonance spectroscopy, depending on the MoO 3 concentration ranging from 5 to 25 mol% and the CdO/B 2O 3 ratio. The measurements have shown that the structural net of the synthesized glasses consists mainly of [BO 3], [AlO 4] and [SiO 4] groups. [BO 4] groups may possibly be present when CdO concentrations range between 10 and 20 mol%. Molybdenum is predominantly four fold coordinated. Six fold coordinated molybdenum may exist in glasses with low Cdo and high MoO 3 concentrations. The EPR spectra of the glasses have revealed paramagnetic centers which are due to Mo 5+ ions. Octahedral arrangement around Mo 5+ ions is also suggested, with symmetry varying from axial to rhombic depending on chemical compositions.