Abstract
X-ray irradiation was applied to mixed alkali silicate and sodium borosilicate glasses. In the former glasses, the energy of visible absorption due to non-bridging oxygen hole centers decreased along with the increase of average basicity of the glasses. This is related to weakning of the Si-O bonding with the presence of the alkali metal cations. In the sodium borosilicate glasses, the induced absorption due to Si-O-Na linkage appeared only in the concentration range of [Na2O]/[B2O3]>1; thus the peculiarity of the microstructure of sodium borosilicate glass, such as phase separation was also reflected to the irradiation phenomena. From the thermal bleaching of the irradiated glasses, the relative stability of the defect centers could be differenciated.
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