Bismuth silver phosphate glasses as alternative matrices for the conditioning of radioactive iodine
In the context of the management of radioactive wastes, iodine constitutes a special case owing to its volatility that does not enable its vitrification into conventional borosilicate glasses. Silver phosphate glasses are good candidates, since they can be melted at low temperature and they can accommodate large AgI quantity within their glass network. To improve their thermal characteristics, Al2O3 is added in the glass formulation in order to increase the glass network reticulation. But only a limited amount can be used, since phase separation is observed through the formation of Al(PO3)3 crystals. We show that Bi2O3 can be used as an efficient alternative to Al2O3. DSC curves indicate that the crystallization peak is almost supressed, and 31P NMR shows the formation of bismuth phosphate groups but no formation of any crystalline phase. These effects are discussed in terms of cationic field strength and polarisability.
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Document Type: Research Article
Publication date: 01 April 2015