Glasses Technology

XPS O1s spectra were recorded for glasses in the binary PbO-Ga//2O//3 and ternary PbO-Bi//2O//3-Ga//2O//3 systems. Large shoulders with chemical shifts of 1.4 to 1.9 eV were observed in the O1s spectra recorded from PbO-Ga//2O//3 glasses. These shoulders were attributed to the presence of nonbridging oxygens in the structure. The shoulders indicated that, contrary to previous results, PbO was a network modifier as well as a charge compensator and network former. The additionof Bi//2O//3 reduced the number of nonbridging oxygens and, therefore, it was classified as an intermediate. Ga//2O//3 seemed to form GaO//4^- tetahedra, constituting the backbone of the network strcture. Glasses in the PbO-Bi//2O//3-Ga//2O//3 system had their IR cutoff edges located at 7?m with glass transition temperatures in the range of 320° to 400?.

Heo, Jong.?Kim, Choon Gon.?