Influence of gamma radiation on the structural and optical properties of thulium-doped glass

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2017-12, Vol.226, p.158-163
• Main Authors: Halimah, M.K., Hasnimulyati, L., Zakaria, A., Halim, S.A., Ishak, M., Azuraida, A., Al-Hada, Naif Muhammed
• Format: Article
• Language: English
• Subjects: Absorption spectra; Boron oxides; Density; Effects; Electrons; Free electrons; Gamma irradiation; Gamma rays; Molar volume; Optical properties; Quenching; Radiation; Radiation dosage; Structural properties; Tellurite glass; Thulium; Thulium-doped glass; Zinc oxide
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2017.09.010

•Some structural changes occur inside the glass samples after the radiation process.•The density has a maximum value at 20kGy and minimum value at 35kGy.•The optical band gap decreases due to formation of defects,NBOs and free electrons. A few selected numbers of researches has been done to study the effect of gamma radiation in structural and optical properties of Tm-doped glass. Hence, the present study is done in order to overcome this problem. Tm-doped glass sample with composition of {[(TeO2)0.7(B2O3)0.3]0.7[ZnO]0.3}0.99{Tm2O3}0.01 was prepared using melt-quenching technique. Density, FTIR, XRD and UV-VIS analyses were done before and after radiation with doses ranging from 10 until 35kGy. With the increment of the radiation dose, the density and molar volume vary; indicating the variation in the compactness of the glass samples. FTIR analysis showed the changes in the absorption bands. The glasses still maintain its amorphous nature as confirmed by the XRD spectra. The direct and indirect optical band gaps showed a decreasing trend due to the breaking of bonds and existence of free electrons. Meanwhile, the other optical data have an increasing trend which was due to the presence of free electrons inside the glass system.