RuO2-borosilicate glass composites representing nuclear glasses show a sudden increase in electrical conductivity when the RuO2 content reached concentration of around 1% volume. This percolation threshold is astonishingly low compared to geometrical threshold, i.e. 15%, considering random distribution phases. Herein, electrostatic force microscopy (EFM) analyses were used investigate this anom...

X-ray absorption spectra (XAS) were collected and analyzed to characterize bismuth (Bi) environments in borosilicate glass formulations developed for the immobilization of high level nuclear wastes (HLW), from the bismuth phosphate process. Therefore, the structural role of Bi in these glasses is of interest; in addition in the present study, more particular interest in Bi originated from unusu...