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|Title:||UV-visible, infrared, Raman and ESR spectra of gamma-irradiated TiO2-doped soda lime phosphate glasses|
|Authors:||El-Batal, Fatma H|
|Keywords:||Soda lime phosphate glass|
|Abstract:||Undoped and TiO2-doped soda lime-phosphate glasses were prepared. UV-visible, infrared, Raman and electron spin resonance spectroscopic studies of the prepared samples, with varying compositions and increasing TiO2 contents, were measured before and after successive gamma irradiation. The parent undoped glass reveals strong UV absorption originating from trace iron impurities. Experimental data indicate that titanium ions are involved in two valencies in such glasses, namely the trivalent and pentavalent states. The trivalent titanium (Ti3+) ions are characterized by its purple colour and showing characteristic two visible absorption bands and paramagnetic ESR character. The tetravalent titanium (Ti4+) ions belong to the d° configuration and possess only charge transfer ultraviolet absorption interfering with the UV bands due to trace iron impurities as evidenced in the undoped specimen. Glasses with high TiO2 contents show retardation or shielding effect towards successive gamma irradiation. The changes in the UV, visible and infrared absorption spectra are interpreted in relation to the generation of induced defects by irradiation and the response of the change in glass composition or TiO2 content. Raman and ESR measurements support the proposed interpretations of the experimental results.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.47(09) [September 2009]|
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