Study of Molybdenum Incorporation in Nuclear Waste Glasses: Effect of Compositional Variations in Borosilicate Glasses Rich in MoO 3 (original) (raw)
The incorporation of molybdenum is one of the major challenges in the nuclear glass formulation issues, since its relatively low incorporation rate could induce the crystallization of Mo-rich soluble phases during the cooling down of the glass. In the scope of the reprocessing of increased burn up rates of UO 2 spent fuels, a new glassy material with high level waste (HLW) content is in development. The aim of this paper is to present the molybdenum oxide behavior in a simplified soda-lime borosilicate composition derived from that of what could be this HLW glass. Several studies performed on glass series with 5.6 wt% MoO 3 and with variable contents of boron and calcium oxides showed the strong impact of these oxides on the molybdates crystallization tendency (XRD experiments). Moreover, addition of calcium and boron oxides promoted the incorporation molybdenum in the glass network (microprobe analysis).
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