Abstract:
The effects of doping iron phosphate glass-ceramic wasteforms containing high level waste (HLW) with different B
2O
3 contents on their structures and properties were investigated. The chemical durability of glass-ceramic wasteforms was measured by dissolution rate (DR) method. The structure of the glass-ceramic wasteforms was analyzed by Fourier turning infrared (FTIR) and X-radiation diffraction (XRD). The results show that glass-ceramic wasteforms have the main crystalline phase of monazite. There are great effects of wasteforms on the chemical durability. The 28 d leaching rate of glass-ceramic watesforms is 7.81×10
-9 g/(cm
2•min) when 10% (mole percent) Fe
2O
3 is replaced by B
2O
3 in watesforms. Samples exist a large number of PO
43-, a small amount of P
2O
74- and no PO
3-. Boron in wasteform samples is present as tetrahedral BO
4 units.