A decade ago, a new type of self-organization process was observed in the bulk of SiO2 glass after irradiation with ultrashort laser pulses [1]. Under certain irradiation conditions, highly ordered nanostructures with features smaller than 20 nm could be formed in the irradiated volume. The sub-wavelength arrangement of these structures results in form birefringence, which was recently exploite...

Modified iron phosphate glasses have been prepared with nominal molar compositions [(1−x)·(0.6P2O5– 0.4Fe2O3)]·xRySO4, where x = 0–0.5 in increments of 0.1 and R = Li, Na, K, Mg, Ca, Ba, or Pb and y = 1 or 2. In most cases the vast majority or all of the sulfate volatalizes and quarternary P2O5–Fe2O3–FeO–RyOz glasses or partially crystalline materials are formed. Here we have characterized the ...

The local environments around Ti, Cr, and several light rare-earth elements (La, Ce, and Nd) were investigated by in-situ XANES spectroscopy in a number of complex borosilicate glasses and melts (to 1120 °C) that are used for nuclear waste storage. Examination of the high-resolution XANES spectra at the Ti K-edge shows that the average coordination of Ti changes from ~5 to ~4.5. Cr is dominantl...

The present study focuses on understanding the structural dependence of sulfur (as SO3) solubility in Na2O–B2O3–SiO2 glasses over a broad composition space exhibiting rich variety associations. focus is probing impact (1) role Na+, (2) degree polymerization, and (3) network former connectivity (formation Si–O–B B–O–B linkages) borosilicate glasses. By employing suite state-of-the-art characteri...