Spectroscopic and EPR studies on PbO-Y2O3-P2O5 glasses doped with molybdenum ion

The structure of 40PbO-(10-x) Y2O3-50P(2)O(5): x MoO3 glass system with 0 <= x <= 5 mol% was prepared and investigated by IR, differential thermal analysis techniques, optical absorption and EPR spectroscopy. The characteristic IR bands of these glasses due to the stretching and bending vibrations were identified and analyzed by increasing of MoO3 content. The results of differential scanning calorimetric studies suggest that the glass forming ability is higher for the glasses containing MoO3 beyond 5 mol%. The intensity and frequency variations for the characteristic phosphate group vibrations have been correlated with the changes of the structural units present in these glasses. All the investigated samples exhibit EPR signals which suggest that the molybdenum ions exist in Mo5+ state with Mo6+ act as modifiers with MoO4 and MoO6 structural groups in these glasses. The shapes of spectra are also changed with the increasing of molybdenum ions content. (C) 2013 Elsevier B.V. All rights reserved.