Abstract
The optical absorption spectra of undoped soda lime silicate glass together with two glasses doped with either (1 % nano Fe2O3 ) or with both (1 % Nano Fe2O3 + 5 % cement dust) have been measured from 200 to 2400 nm before and after gamma irradiation with a dose of 8 Mrad. The undoped glass reveals strong UV absorption with two distinct peaks which are attributed trace ferric iron ions present as impurity. Upon gamma irradiation , this base glass exhibits three peaks at 240,310 and 340 nm and the resolution of an induced broad visible band centered at 530 nm. The two doped glasses show an additional small visible band at about 440 nm and followed by a very broad band centered at 1050 nm. Upon gamma irradiation, the two doped samples reveal the decrease of the intensities of the spectrum. The two additional bands are related to ferric (Fe+3) ions to the band at (440 nm) while and the broad band at 1050 nm is due to ferrous iron (Fe+2) ions. The decrease of the intensities of the UV-visible spectrum upon irradiation can be related to of capturing freed electrons during irradiation . Infrared spectra of the glasses reveal repetitive characteristic absorption bands of silicate groups including bending modes of Si–O–Si or O–Si–O, symmetric stretching , antisymmetric stretching and some other peaks due to carbonate , molecular water , SiOH vibrations . Upon gamma irradiation, the IR spectra reveal a small change in the base spectrum while the IR spectra of the two doped glasses remain unchanged. The change of the IR spectrum of the base glass is related to suggested changes in the bond angles or bond lengths of the mid band structural units. The doped glasses show resistance to gamma irradiation because the nano Fe2O3 can capture released electrons and positive holes.
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ElBatal, H.A., Hassaan, M.Y., Fanny, M.A. et al. ‘Optical and FT Infrared Absorption Spectra of Soda Lime Silicate Glasses Containing nano Fe2O3 and Effects of Gamma Irradiation. Silicon 9, 511–517 (2017). https://doi.org/10.1007/s12633-014-9262-7
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DOI: https://doi.org/10.1007/s12633-014-9262-7