30 wt.% simulated nuclear wastes were successfully immobilized by B2O3-doped iron phosphate base
glasses. The structure and thermal stability of the prepared wasteforms were characterized by Fourier
transform infrared spectroscopy and differential thermal analysis, respectively. The subtle structural
variations attributed to different B2O3 doping modes have been discussed in detail. The results show that
the thermal stability and glass forming tendency of the iron borophosphate glass wasteforms are faintly
affected by different B2O3 doping modes. The main structural networks of iron borophosphate
glass wasteforms are PO4
3, P2O7
4, [BO4] groups. Furthermore, for the wasteform prepared by using
10B2O3–36Fe2O3–54P2O5 as base glass, the distributions of Fe–O–P bonds, [BO4], PO4
3 and P2O7
4 groups
are optimal. In general, the dissolution rate (DR) values of the studied iron borophosphate wasteforms are
about 108 g cm2 min1
. The obtained conclusions can offer some useful information for the disposal of
high-level radioactive wastes using boron contained phosphate glasses.
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