Yazar "Aloraini, Dalal Abdullah" seçeneğine göre listele

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    Comprehensive study of optical, thermal, and gamma-ray shielding properties of B2O3-SiO2-BeO- MgO-La2O3, glasses
    (Elsevier, 2024) Alsafi, Khalid; Aloraini, Dalal Abdullah; Almutairi, Haifa M.; Issa, Shams A. M.; Zakaly, Hesham M. H.; Shaaban, Kh S.
    The purpose of this work is to study the thermal, optical, structural, and radiation-shielding features of glass system with composition 57B2O3-16SiO2-11BeO- (16-x) MgO-xLa2O3, x = (0 <= x >= 16). The structural characteristics of glass samples are examined using XRD. This glass's molar volume decreased from 18.21 to 17.46 (cm3/mol), while its density increased from 3.213 to 5.967 g/cm3. Differential thermal analysis data were used to assess the thermal stability (Delta T) for BSLa samples. It was discovered that when the La2O3 amount increased, the glass stability increased. The optical band gap (Ediopt), (Eindi opt ) and Urbach's energy (Eu) were computed using UV absorption spectra. (Ediopt) decrease from 4.323 to 3.816 eV and (Eindiopt) decrease from 3.413 to 2.95 eV, whereas (Eu) increase from 0.278 to 0.324 as a result of the changes of borosilicate's structured caused by the addition of La2O3. The examined glasses may be utilized for non -linear optical applications, according to the high (n) and low metallization (M) values. The Phy-X tool was utilized to obtain (MAC), (LAC), and (Zeff) of the suggested glasses within the energies 0.015-15 MeV. The BSLa16 sample achieved the highest values of the (MAC), (LAC), and (Zeff). Consequently, BSLa16 is a good option for gamma-ray shielding applications.
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    Synthesis, physical, structural, mechanical, and nuclear radiation shielding properties in cerium dioxide reinforced lead-silicate glasses
    (Elsevier ltd, 2025) Zakaly, Hesham M.H.; Aloraini, Dalal Abdullah; Wahab, E.A., Abdel; Issa, Shams A.M.; Tekin, Hüseyin Ozan; Shaaban, Kh. S.
    Notably, cerium dioxide (CeO2)-containing lead silicate glasses have attracted considerable attention, which is attributed to their versatile properties and possible use in many domains of technology. This work investigates the effect of CeO2 doping on the structural, mechanical, and radiation shielding performance of 60SiO2-35Pb3O4-5ZnO glasses. Materials Glasses were prepared via the melt-quench approach and characterized with XRD, density and ultrasonic velocity measurements, and Monte Carlo simulations for radiation shielding evaluation. The results confirm that adding CeO2 to the glasses increases their density, elastic moduli, and microhardness, and, therefore, their mechanical strength and rigidity. The density of the glass samples grew from 5.91 g/cm³ for SPCZ0 to 6.463 g/cm³ for SPCZ4 with increasing CeO2 content. The VL increased from 4790 m/s for the undoped glass sample (SPCZ0) to 5290 m/s for the sample with the highest content of CeO2 (SPCZ4). The VT similarly increases from 2385 m/s for SPCZ0 to 2885 m/s for SPCZ4. Moreover, the results suppose that CeO2-doped glasses had higher attenuation coefficients against gamma-ray and neutron radiation in relation to undoped samples. These properties are of utmost importance for their deployment in components requiring high mechanical strength, durability, and efficient absorbing layers for radiation protection.
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    Y 2 O 3 reinforced B 2 O 3-SiO 2-BaO-Na 2 O glass system: A characterization study through physical, optical and gamma / neutron shields characteristics
    (Elsevier, 2024) Alsafi, Khalid; Zakaly, Hesham M. H.; Aloraini, Dalal Abdullah; Al-Saleh, Wafa M.; Almutairi, Haifa M.; Issa, Shams A. M.; Shaaban, Kh S.
    Glasses with the composition 48B 2 O 3 - 13SiO 2 - 7BaO- (32-x) Na 2 O-xY 2 O 3 , (x = 0, 1, 2, 4, and 8 mol %) were synthesized by the melt quenching procedure. There is good transparency in every glass sample. The increase in density (2.825-3.894 gm/cm 3 ) of the present glasses is what triggered the decline in molar volume (25.41-21.80 cm 3 /mol) and the decrease in the Boron-Boron distance (0.475-0.452 nm). The estimated values show that E indi . opt . & E di opt . are 2.317, 2.672, 2.8, 2.98 and 3.1 eV, 2.69, 2.92, 3.05, 3.25, and 3.44 eV respectively, whereas (E u ) values declined. As the Y 2 O 3 increased the refractive index ( n D ) increased. ( n D ) of the synthesized glasses using E indi . opt . & E di opt . were estimated. To find the radiation properties of the suggested glasses, the Phy-X/PSD code was employed. We concluded that the current glasses have better radiation shielding capabilities when employed in such fields. As the Y 2 O 3 replacing ratio increased & sum; R increased.