IR spectra and structure of glasses in the BaO-WO3-P2O5 system

Studied are IR absorption spectra and determined are the main structural characteristics of tungstophosphate glasses of the BaO-WO3-P2O5 system in all the area of glass formation. It is shown that the main structural components of their anion network are phosphate chains consisting of PO4 tetrahedrons and tungstate chains consisting of WO4 tetrahedrons and of WO6 octahedrons. These chains are connected by P-O-W bridges into three-dimentional tungstophosphate network, where the ratio of phosphate and tungstate structural units and their polymerization degree change without limits depending on the glass composition. Analysis of concentration frequency dependence and spectral band intensity permit to clarify the effect of each component on the glass structure in all the area of glass formation of the triple system