Raman and X-ray absorption spectroscopic studies of hydrothermally altered alkali-borosilicate nuclear waste glass

The effects of γ-radiation on model vitreous wasteforms intended for the disposal of intermediate and high level radioactive wastes in the United Kingdom

“…Fig. 12a band assignments are in good agreement with Raman observations of alkali-borosilicate glasses, and Fe-rich alkali borosilicate glasses [45,46,[48][49][50][51][52][53][54][55]. In addition to the aforementioned bands, a strong band located at 990 cm À1 was detected in glasses G11 and G73, and fitting of data from glass G78 also indicated a contribution from a band at $990 cm À1 ; however, this band was absent from the glass MW-25%.…”

Changes in surface structure of sodium aluminoborosilicate glasses during aqueous corrosion analyzed by using NMR

“…On the other hand, the fraction of the Q 3 and Q 4 species remained nearly constant for R08 glass; an appearance of the Q 4 species after dissolution was observed for the R20 glass. A decrease in connectivity in the Si network after dissolution has been reported for nuclear waste glass from surface analysis by Raman spectroscopy [6,40]. An ion-exchange model of the dissolution behavior of alkali-silicate glasses has been proposed by considering the interdiffusion of hydrogen or hydronium ions from water to alkali ions in the glass.…”

XAS and XRF investigation of an actual HAWC glass fragment obtained from the Karlsruhe vitrification plant (VEK)

“…They observed that cesium ions occur in a slightly distorted twelve-fold coordinated oxygen environment at Cs 2 O contents of 1-2 mol.%, whereas at higher Cs 2 O contents the coordination number and average CsAO bond distance decrease significantly. Researchers of the Catholic University of America, Washington DC, and the Glenn T. Seaborg Center at Lawrence Berkeley National Laboratory, Berkeley, CA, have put the dissimilar behavior of Tc and its chemical homolog Re in the same column of the periodic table into the focus on their spectroscopic studies on corroded borosilicate glasses [25][26][27][28][29][30]. Simulated waste glasses containing both Tc and Re were synthesized under a variety of redox conditions to produce different distributions of Tc and Re oxidation states.…”