Structure of cesium loaded iron phosphate glasses: An infrared and Raman spectroscopy study

The structure of cesium loaded iron phosphate glasses (IPG) was investigated using infrared and Raman spectroscopy. The spectra of the cesium doped samples revealed a structural modification of the parent glass owing to the incorporation of cesium. The structural changes could be correlated with the variation observed in the glass transition temperature of these glasses. Increased Cs-mediated cationic cross linking appears to be the reason for the initial rise in glass transition temperature up to 21 mol% Cs 2O in IPG; while, breakdown of the phosphate network with increasing cesium content, brings down the glass transition temperature.