| Preparation and Properties of Lead-Iron-Phosphate
Nuclear Waste Glasses |
Goutam Hazra,1 Partha Mitra2 and Tanmoy Das3, *
Page : 69-77
DOI : 10.1080/0371750X.2019.1598281 |
| 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 8.210–4 to 4.310–3 g.m–2.h–1 at 90oC which
is 1000 times lower than that of the borosilicate glasses. Thermal study shows
that the glass transition temperature was in the range of 360o-400oC 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.
[Keywords: Radioactive waste, Safe immobilization, Glass-former and modifier,
Radiotracer technique, Leaching] |
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