Abstract
Optical absorption spectra of undoped and TiO2-doped lithium phosphate glasses were measured before and after successive gamma irradiation. Undoped lithium phosphate glasses show strong UV absorption, while TiO2-doped samples exhibit surplus two broad visible bands due to the presence of Ti3+ ions in predominant ratio. Gamma irradiation produces UV and visible induced bands but the presence of TiO2 seems to cause some shielding effects towards successive gamma irradiation. Infrared absorption spectral measurements indicate the presence of characteristic phosphate groups and the effect of gamma irradiation is limited to small changes in the intensities of some absorption bands. The experimental results are interpreted on the bases of current views on the structure of the studied host glass in relation to properties studied.
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