Vibration Spectroscopic Analysis on Microstructure of Iron Phosphate Glasses with Sodium Oxide

In order to explore the property of various sodium contents in nuclear waste in iron phosphate glasses and the effect of Na2O on microstructure of iron phosphate glasses was investigated. xNa2O-( 100- x)( 40Fe2O3-60P2O5)( 0≤x≤50mol%) glasses were prepared by the melt-quenched method. Their microstructure networks were characterized by X-ray diffraction( XRD),Raman and Fourier transform infrared spectroscopy( FT-IR),and attribution of the vibration spectrum bands were identified. The results indicated the compositions containing up to 50 mol% of Na2O formed homogeneous glasses. The base glass consists predominantly of Q1units,with increase of the Na2O content,Q1decreased and Q0 increased gradually,and the formation of P-O-Na+ionic bond also increased. In the glass with 40 mol% Na2O contents,the band at Q1units disappeared. The increase of non-bridging oxygen bonds and the decrease of bridging oxygen bonds result in the depolymerization of phosphate glasses structure and the relaxation of microstructure networks with the addition of Na2O content.