Browsing by Author "Ahmed, E. M., & Abouhaswa, A. S."

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B2O3/PbO/Na2O/MgO/Nb2O5 glasses: fabrication, physical, optical characteristics as well as photons/neutrons/beta particles attenuation capacities.
(ELSEVIER, 2022) Alsaif, N. A., Rammah, Y. S.,; OLARINOYE, OYELEKE; Ahmed, E. M., & Abouhaswa, A. S.
Physical, optical characteristics, and radiation attenuation capacities of the prepared (50-x) B2O3 + 30PbO + 10Na2O + 10MgO + xNb2O5 glasses with various doping ratios x = 0, 2, 4, 6, and 8 mol% have been investigated. Glasses were prepared using the well-known melt quenching process and named as their corresponding x value. The density and molar volume of the prepared glasses were increased from 4.71 g/cm3 and 23.76 cm3/mol for the sample with free Nb2O5 to 4.91 g/cm3 and 25.99 cm3/mol for the rich sample with x = 8 mol% of Nb2O5. With increasing Nb2O5 concentration, the broad near-visible band centered was moved towards higher wavelength. The direct band gap energies of glass samples felt from 3.728 to 2.939 eV, while the indirect band gap energies from 3.032 to 1.822 eV as the Nb2O5 substitution ratio increased. Urbach’s energies of the prepared samples were increased with the increasing of Nb2O5. For photons, the maximum values of mass attenuation coefficient (MAC) were 32.67, 33.02, 33.38, 33.74, and 34.10 cm2/g for x = 0 – x = 8, respectively at 0.015 MeV, while the least corresponding MAC value of 0.0286, 0.0288, 0.0291, 0.0293, and 0.0295 cm2/g was obtained at 10 MeV. For neutrons, the fast (MAC)FN was decreased from 0.0185 – 0.0161 cm2/g, while the thermal (MAC)TN was decayed from 6.6538 – 5.5903 cm2/g. Analysis of the TSP and CSDA range of the glasses emphasize the fact that there is no significant difference in the charged particle of the glasses irrespective of the weight fraction of Nb2O5 relative B2O3. Results confirm that the current glasses are superior for radiation shielding materials compared to some commercial concrete and glasses.
Responsibility of Bi2O3 Content in Photon, Alpha, Proton, Fast and Thermal Neutron Shielding Capacity and Elastic Moduli of ZnO/ B2O3/Bi2O3 Glasses
(SPRINGER, 2021) Rammah, Y. S., El-Agawany, F. I., Gamal, A.,; OLARINOYE, OYELEKE; Ahmed, E. M., & Abouhaswa, A. S.
The effect of Bi2O3 content on photon, alpha particle, proton, fast and thermal neutron shielding capacity, and elastic moduli of 10ZnO-(90-x)B2O3-xBi2O3 (ZBB-glasses): x = 25–50 mol% has been investigated. The mass density and Bi-content of the ZBB-glasses had the greatest impact on the values of mass and linear attenuation coefficients. The mass and linear attenuation coefficients values were followed the trend (ZBB25)MAC,LAC < (ZBB30) MAC,LAC < (ZBB35) MAC,LAC < (ZBB40) MAC,LAC < (ZBB45) MAC,LAC < (ZBB50) MAC,LAC. The mean free path (MFP) and half value layer (HVL) were having the same trend and opposite to which obtained in mass and linear attenuation coefficients. All the ZBB-glasses showed almost similar charged particle shielding capacity. However, ZBB50 had a comparable charged particle absorption efficiency. There was a 57% growth in fast neutron removal cross section as Bi2O3 molar concentration increased to 50% in the ZBB-glass matrix. ZBB50 possesses the highest fast neutron removal cross section among the ZBB-glasses. In terms of thermal neutron absorbing capacity, the presence of B in the glass matrix ensures that the ZBB-glasses are good thermal neutron absorption. ZBB25 has the highest thermal neutron absorption capacity among the investigated glasses. Generally, ZBB-glasses can be adopted for photon, thermal neutron, proton, and alpha particle shielding purposes. In addition, elastic (shear, longitudinal, and Young’s) moduli and Poisson’s ratio are changed significantly with the increase of Bi2O3 content mol% in ZBB-glasses.