Suleiman BADAMASI

Tellurium dioxide among the numerous glass formers have been of interest to researchers due to its promising characteristics. Consequently, absorption and emission are among the most paramount features of glasses applicable in lasers and other optical devices, but there are not much report on absorption and emission properties of Zinc-Sodium-Tellurite Dysprosium doped glasses. Series of dysprosium (Dy3+) ions doped zinc-sodium-tellurite glass having composition (65-x)TeO2-25ZnO-10Na2O-xDy2O3 (0 ≤ x ≤ 2.5 mol%) were prepared using melt-quenching method. Transparent and thermally stable glass samples were characterized via UV-Vis-NIR absorption, photoluminescence (PL), and Fourier transform infrared (FTIR) spectroscopy. Density and molar volume of prepared glass system were found to be in the range of 5.334-5.366 gm-3 and 24.425-25.273 cm3mol-1, respectively. FTIR spectra exhibited various bonding vibrations corresponding to glass network structures and units. UV-Vis-NIR spectra revea...

This research was aimed at investigating the Elemental Analysis of Some Metals composition of twenty (20) water samples from the different sources (Borehole, wells, Irrigation and Tap) within Tudun Wadan Dankade Local Government Area using Gamma Spectroscopy to determine the concentration of the elements present in the water sample using a well-calibrated NaI (TI) detector system. The result of the analysis was compared with the reference permissible limit to ascertain whether or not the water is safe for drinking. The mean radioactivity content obtained for K-40,

Over the years there has been numerous researches on thermal stability and other thermal parameters of glasses. Among the glasses, tellurite glasses has become more interesting but challenging lately. These properties are essential in unravelling the physical properties of the glasses. But there is not much information on thermal properties of Dysprosium doped zinc sodium tellurite glass, hence the need for this study. Therefore systematic series of quaternary zinc sodium tellurite glasses doped with dysprosium ion in the form (65-x)TeO2-25ZnO-10NaO-xDy2O3 (where x = 0.0, 0.4, 0.8, 1.2, 1.6, and 2.5 mol%) have been successfully prepared via conventional melt quenching technique. X-Ray Diffraction (XRD) pattern was used to confirm the amorphous nature of the glasses, while density (ρ) of the prepared glasses were obtained via Archimedes method. Differential thermal analysis (DTA) curves for the studied glass samples with different Dy2O3 contents have been obtained to determine the glass transition temperature (í µí±‡g), crystallization temperature (Tc), glass stability temperature (ΔTs) Hruby's parameter (H). From the DTA profile, the glass transition temperature Tg, was in the range of 287-302 °C, crystallization temperature Tc from 408-502 °C, glass melting temperature Tm, 662-659 °C and crystallization onset temperature Tx is estimated to be between 354-389 °C. The thermal stability factor, defined as ΔTs = Tc-Tg, for all the samples are higher than 100 °C while Hruby's parameter H, is 0.47-1.33. These suggest that the prepared tellurite glass exhibits a good thermal stability and consequently might be a potential candidate for fibre drawing and other nonlinear optical devices.

Rare earth ions (REIs) doped binary and ternary tellurite glass systems are attractive because of several technological appications. Transparent tellurite glasses can be achieved by combining the vitrified tellurium oxide (TeO2) host with various modifier oxides of Zinc (ZnO), Sodium (Na2O), Silicon (SiO2), etc. over a wide composition range. Tellurite system is wellknown for large intake of REIs, excellent optical properties and low phonon energy cutoff. Determining the influence of dysprosium (Dy3+) ions doping on the improvement of physical, structural and optical properties of tellurite glasses is the main focus of this research. A series of Dy3+ ions doped zinc-sodium-tellurite glass having composition of (65-x)TeO2- 25ZnO-10Na2O-xDy2O3 (0 = x = 2.5 mol%) are prepared using melt-quenching method. Synthesized samples are characterized at room temperature via different analytical techniques. X-ray diffraction pattern verified the amorphous nature of the synthesized glass samples ...