Abstract
Lead-iron phosphate (LIP) glasses are a promising new waste form for safe immobilization of both high level defence and high level commercial radioactive waste for long term disposal. LIP glasses have several advantages such as lower aqueous corrosion rate, lower processing temperature, etc. The durability test for LIP glasses showed that the alkaline earth oxides BaO, SrO and CaO decrease the durability while PbO, Fe2O3 and CeO2 improves the corrosion resistance. For some LIP glass samples containing uranium the leach rates as calculated from BET surface areas were in the range of 8.2×10–4 to 4.3×10–3 g.m–2.h–1 at 90°C which is 1000 times lower than that of the borosilicate glasses. Thermal study shows that the glass transition temperature was in the range of 360°-400°C for the LIP glasses. IR studies show absorptions at 520, 1025, 1700, 2225 and 3450 cm–1. The observed IR and Raman scattering spectra are representative of a mixture of chain terminating Q1 species and chain forming Q2 species. From the radiotracer leaching studies the role of Ce4+ as good binder-modifier is established. The values of isomer shift in the Mössbauer spectra increases with increasing Fe2O3 content.
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