تاثير جسيمات الفضة النانوية على الخواص البصرية لزجاج التليريوم المشوب بايونات العنصر الارضي النادر السماريوم == effect of silver nanoparticles on the optical properties of glass Tellurium doping ions rare earth element Samarium
Author name:
عماد محمد احمد عبد الله المرسومي
Supervisor name:
طارق عبد الرضا علوان الظاهر
General topic:
Physics
Specific topic:
Nuclear and Environmental Physics
Degree:
Master
University:
University of Baghdad - Ibn Al-Haytham College Of Education For Pure Sciences - Physics Department
Language:
Arabic
University location:
Baghdad
First pages:
26T1885 - p.pdf
Abstract:
The preparation of co - doping Tellurium glass of TeO2−B2O3−PbO by silver nanoparticles and Samarium were performed according 80TeO2−(7.5−x)B2O3−12PbO−0.5Sm+3−(x)Ag. where (x=0,0.05,0.1,0.15,0.2,0.25 mol%) by melting quench technique and annealed at 300°C for 3h as a first stage of this study.The prepared samples of glass ceramic with dimensions 1mmx1cmx2cm were characterized by XRD, SEM and TEM for their structural identification. UV - spectrophotometer in the wavelength (200 - 1100 nm ) Shimadzu and K - Mac SA miniature UV - VIS spectrometer - spectra were used for their absorption and fluorescence spectra.Patterns of XRD revealed amorphous structure for all sample. The element compositions were identified by TEM and EDX attached to SEM. Their densities 5.37 - 5.49 g/cm3 were measured by Archimedes experiment, and the corresponding molar volume were calculated in the range 29.7 - 29.1 cm−3.Their variation occur due to the molarity increase of doping.The absorption spectra revealed seven peaks which represented the transition from the ground state 6H5/2 to different excited states. The band gap for direct transition for all samples about 2.3 eV, while for indirect transition around 1.91eV.The highly doped sample named A5 is selected for fluorescence spectroscopy .It spectra showed five emission bands at 430(4G9/2➙4H5/2), 435(4G9/2➙4H7/2), 450(4G9/2➙4H7/2) , 600 (4I13/2➙4H9/ٕ)and 645(4 G 5/ٕ➙6H15/2) transitions. Then according to the resulted fluorescence spectra of it, two additional samples B1 and B2 were prepared with the same molar percentage as A5,but annealed at the same temperature for 6h and 9h. And two more sampleswere prepared by increases their molarity to 1% and 1.5% for both samarium and silver, symbolized by C1 and C2 respectively. The intensities of their fluorescence spectra increases many times for the same emission bands as it is compared with the same emission bands of A5.
