The purpose of this study was to determine the solubility of iodine in a low-activity waste borosilicate glass when heated inside an evacuated and sealed fused quartz ampoule. The iodine was added to glass frit as KI in quantities of 100–24000 ppm iodine (by mass), each mixture was added to an ampoule, the ampoule was heated at 1000 °C for 2 h and then air quenched. In samples with =12000 ppm iodine, low viscosity salt phases were observed on the surface of the melts during cooling that solidified into a white coating upon cooling. These salts were identified as mixtures of KI, NaI, and Na2SO4 with X-ray diffraction (XRD). The iodine concentrations in glass specimens were analyzed with inductively-coupled plasma mass spectrometry and the overall iodine solubility was determined to be 10000 ppm by mass. Several crystalline inclusions of iodine sodalite, Na8(AlSiO4)6I2, were observed in the 24000 ppm specimen and were verified with micro-XRD and wavelength dispersive spectroscopy.
Revised: October 8, 2014 |
Published: April 30, 2014
Citation
Riley B.J., M.J. Schweiger, D. Kim, W.W. Lukens, B.D. Williams, C. Iovin, and C.P. Rodriguez, et al. 2014.Iodine Solubility in Low-Activity Waste Borosilicate Glass at 1000 °C.Journal of Nuclear Materials 452, no. 1-3:178-188.PNNL-SA-100866.doi:10.1016/j.jnucmat.2014.04.027