FTIR spectra and properties of iron borophosphate glasses containing simulated nuclear wastes

• DOI: 10.1016/j.molstruc.2015.03.034
• Publication Date: 2015-04-02T16:47:03Z
• Authors: Qilong Liao; Fu Wang; Kuiru Chen; Sheqi Pan; Hanzhen Zhu; Mingwei Lu; Jianfa Qin
• Keywords: Iron phosphate; Thermal Stability; Phosphate glass; Base (topology)

Abstract 30 wt.% simulated nuclear wastes were successfully immobilized by B 2 O 3 -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 B 2 O 3 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 B 2 O 3 doping modes. The main structural networks of iron borophosphate glass wasteforms are PO 4 3 − , P 2 O 7 4 − , [BO 4 ] groups. Furthermore, for the wasteform prepared by using 10B 2 O 3 –36Fe 2 O 3 –54P 2 O 5 as base glass, the distributions of Fe–O–P bonds, [BO 4 ], PO 4 3 − and P 2 O 7 4 − groups are optimal. In general, the dissolution rate (DR) values of the studied iron borophosphate wasteforms are about 10 −8 g cm −2 min −1 . The obtained conclusions can offer some useful information for the disposal of high-level radioactive wastes using boron contained phosphate glasses.