Abstract
The immobilization of iodine 129 released during the reprocessing of spent nuclear fuels has attracted increasing interest in the field of nuclear waste management. Glass composite materials have been developed to decrease the sintering temperature considering the iodine volatilization. In this study, the effects of the addition (5–25 wt%) of a bismuthate oxide glass powder and sintering temperature (500–1100 °C) on the iodosodalite formation in waste forms were investigated. Microstructure characterization techniques including X-ray diffraction, scanning electron microscopy, energy-dispersive spectroscopy, and X-ray photoelectron spectroscopy were employed to elucidate the I states in the waste form. Phase composition calculations show that the maximum phase mass of iodosodalite was 94%. The sintering temperature was decreased to 600 °C, lower than the decomposition temperature of NaI, after the addition of a 15 wt% bismuthate glass powder. The leaching rate of iodine shows the considerable chemical durabilities of the sintered sample under alkaline and neutral conditions.
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