Abstract
A Yb3+-doped borate glass system was examined for the structural and optical modifications after -irradiation. Among the studied 10BaO-20ZnO-20LiF-(50-x)B2O3-xYb2O3 (x = 0.1, 0.5, 0.7, and 1.0 mol%) glasses, the 10BaO-20ZnO-20LiF-49.9B2O3-0.1Yb2O3 glass showed the highest thermoluminescence intensity, trap density, and trap depth. The glass was irradiated with the optimum -dose of 1 kGy towards the analysis of radiation-induced defects. The amorphous nature was preserved before and after irradiation. The glass density slightly increased after irradiation. The structural rearrangement was evident from the Fourier transform infrared spectroscopy by the appearance and disappearance of some bonds after -irradiation. The transformation of [BO4] units into [BO3] units and non-bridging oxygens was deduced. The color of the glass darkened after irradiation and the optical absorption intensity enhanced between 250 and 700 nm. The optical bandgap reduced and Urbach energy increased upon -dose exposure. The electron spin resonance of the irradiated glass exhibited two signals at g = 2.0167 and g = 1.9938, corresponding to the non-bridging oxygen hole center and Boron E’-center, respectively.
Highlights
Introduction iationsThe interest in researching the radiation effects on glasses, which began in the 1950s, has been growing enormously since [1,2,3,4,5]
The optimum glass sample (10BaO-20ZnO-20LiF49.9B2 O3 -0.1Yb2 O3 ) containing the relatively higher trap density and deeper traps was analyzed for the radiation-induced changes through X-ray Diffraction (XRD), density, Fourier transform infrared (FTIR), optical absorption, and Electron Spin Resonance (ESR) techniques
The glass density was increased after irradiation
Summary
The interest in researching the radiation effects on glasses, which began in the 1950s, has been growing enormously since [1,2,3,4,5]. It is accepted that, when a glass is subjected to ionizing γ-radiation, it acquires some ‘radiation-induced defects’, which alter its network [3]. The interaction of a glass with the incident γ-rays is linked to the rate of creation and buildup of such radiation-induced defects during the course of irradiation [7]. These defects may arise because of atomic displacement by momentum and energy transfer, charge trapping, ionization, and/or radiolytic effects.
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