Structural studies of molybdo-phosphate glasses doped with Zn2+ and Cl- ions

Abstract

Molybdo – Phosphate glasses with a chemical formula xMoO3-15ZnO-2 PbCl2-(83-x) NaPO3 doped with Zn2+ and Cl- ions has been synthesized by microwave route. The vitreous system is studied for the structural evolution using Infra-Red Spectra. The modulated DSC of the investigated samples shows strong composition dependent trends. Glass transition temperatures (Tg) extracted from DSC lies between 593 K and 647 K and it increases with MoO3 content. Addition of MoO3 replaces weaker linkages like P-O-P by stronger Mo-O-P and Mo-O-Mo linkages. The variation of Tg can be understood in terms of the structural groupings, cross- link density and bond strength of the glass network forming units. To verify the variation to the presence of Na2O creates several structural units. Density of the glass samples increases with the concentration of MoO3. Tg, density and molar volume of the glass samples were also observed. Analysis of the Structural investigations have been carried out using Infra-Red Spectra to study the network modification that reveals the structure of molybdo-phosphate glass network made of corner shared tetrahedral [POO3/2]0 and octahedral [MoO4/2]- units.