الفهرس 
CHAPTER 1Only 14 pages are availabe for public view
 |  | from | 16 |  |  |
| | | from | 16 | | |
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.