Abstract
Samples of alkali metal oxide-silica glasses with various kinds and amounts of alkaline earth oxide calcium oxide and silica were prepared, x-irradiated, and studied by spectrophotometry. Bleaching experiments with visible light were carried out. No effect of alkaline earth content upon the absorption spectra was detected.Room temperature bleaching of a ${\mathrm{K}}_{2}$O-SrO-Si${\mathrm{O}}_{2}$ glass with light of wavelength corresponding to the x-ray induced absorption band at 1.95 ev, decreased absorption generally but failed to create a new absorption band such as the ${Z}_{1}$ band found in KCl, containing Sr${\mathrm{Cl}}_{2}$, that has been irradiated and then bleached.Comparisons are made with alkali-halide systems containing alkaline earth halides. It is suggested that there are inadequacies in the quasi-crystalline model of glass when applied to these glasses.
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