الفهرس | Only 14 pages are availabe for public view |
Abstract The glass samples were prepared by melt quenching method. The density of the prepared samples was measured and molar volume was calculated. XRD measurements were made to prove the amorphous nature of the prepared samples. The effect of PbO and LiF on the glass transition temperature was obtained using DTA, FT-IR& ATR spectra were measured for the prepared samples to investigate the glass structure. The IR spectra were deconvoluted using curves of Gaussian shape at approximately the same frequencies. The deconvoluted data were used to study the effect of PbO content on all the structural borate groups. Some structural parameters such as density, packing density, bond length and bond force constant were theoretically calculated and were compared to the obtained experimental results. Deviation between the experimental and theoretically calculated parameters reflects the dual role of PbO content on the network of borate glass. The UV-Vis- NIR spectra were measured to obtain the different transitions of Sm3+ ion for doped samples and to determined the absorption due to lead oxide. The excitation and photoluminescence and cathodoluminscence spectra were recorded. Different transitions obtained from UV, excitation and emission spectra. The energy level diagram of Sm3+has been drawn. Also the effect of PbO on the luminescence properties of Sm3+ was studied. Hypersensitive transitions and stark splitting were also studied. All the obtained physical, structural and spectroscopic properties of our glass samples show that it can be used as efficient laser host material. |