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Your search keyword '"Alsaif, Norah A.M."' showing total 149 results
Start Over Author "Alsaif, Norah A.M."
149 results on '"Alsaif, Norah A.M."'

45. Gd2O3-doped calcium borophosphate glasses for optical and medical applications: experimental and theoretical studies.

Author

Alfryyan, Nada, Al-Ghamdi, Hanan, Alsaif, Norah A.M., Sadeq, M. S., Abouhaswa, A. S., and Rammah, Y. S.

Subjects
OPTICAL glass, OPTICAL susceptibility, MOLECULAR volume, ABSORPTION coefficients, REFRACTIVE index
Abstract

Structure, physical, optical properties, and radiation shielding capacity of some calcium borophosphate glasses with the nominal compositions of 50B2O3 + 20P2O5+(20-X)CaO + 10Na2O + XGd2O3: X = 0 (Gd-0.0), 0.5 (Gd-0.5), 1.0 (Gd-1.0), 1.5 (Gd-1.5), and 2.0 (Gd-2.0) mol% were investigated. The studied samples were prepared via the conventional melt quenching procedure. The Phy-X/PSD software employed to evaluate the γ-ray absorption competence. XRD measurements indicate that the Gd-X samples were in amorphous nature. Density (ρ) increased from 2.31 g/cm3 to 2.60 g/cm3, whereas molar volume (Vm) declined from 34.80 cm3/mol to 33.50 cm3/mol. In UV region, Gd-X glasses recorded two absorption bands at 240 and 280 nm. The optical energy band gap (Eg) ranged from 3.35 to 3.20 eV, whereas refractive index (n) varied from 2.32 to 2.36. Values of the nonlinear refractive index (n2) changed from 4.11 × 10− 11 esu to 4.64 × 10− 11 esu. Values of the values of third order optical susceptibility (χ(3)) changed from 2.53 × 10− 12 esu to 2.89 × 10− 12 esu. Trend of the mass-(MAC) and linear-(LAC) absorption coefficients for Gd-X samples followed by the order that Gd-0.0 < Gd-0.5 < Gd-1.0 < Gd-1.5 < Gd-2.0. Trend of half-(HVL) and tenth-(TVL) value layers followed by the order that Gd-0.0 > Gd-0.5 > Gd-1.0 > Gd-1.5 > Gd-2.0. Results showed that the suggested Gd-X glasses can be applied for optical and medical applications. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Fabrication, Physical, Structural, Optical Properties, and γ‐Ray Attenuation Attributes of Germanate Borosilicate Glasses: Role of GeO2.

Author

Al‐Ghamdi, Hanan, Alsaif, Norah A.M., Alfryyan, Nada, Abouhaswa, A.S., and Rammah, Y.S.

Subjects
*GERMANATE glasses, *MASS attenuation coefficients, *BOROSILICATES, *MOLECULAR volume, *CHEMICAL formulas
Abstract

Samples of germanium borosilicate glasses with chemical formula 50.5B2O3 + 0.5CeO2 + 10SiO2 + (20‐x) CaO + 19Na2O + XGeO2 with 0 (GeO0) ≤ X ≤ 5 (GeO5) mol% were fabricated by using the melt quenching technique. Structure, physical, and optical properties as well as radiation attenuation capacity was examined. XRD data confirmed that GeOX samples were in amorphous state. The density (ρ) of the prepared glass samples increased from 2.24 to 2.55 g/cm3, while the molar volume (Vm) slightly declined from 26.8 to 26.42 cm3/mol. The UV absorption edge shifted to a higher wavelength as the concentration of GeO2 increased. The values of direct band gap (EgDirect)$(\bm{E_g^{Direct}})$ ranged from 3.36 to 2.91 eV, and the indirect (EgIndirect)$(\bm{E_g^{Indirect}})$ ranged from 3.12 to 2.75 eV. Urbach energy (Eu) values fluctuated between 0.65 to 0.16 eV. As the Ge4+ ion increased, the glass sample's refractive index enhanced. Mass attenuation coefficients (MACs) of GeOX samples increased from 6.788 to 10.381 cm2/g at 0.015 MeV. The GeO5 sample possessed the lowest half value layer (HVL) and mean free path (MFP). Effective atomic number (Zeff) of GeOX possessed the same trend of MAC. Results confirmed that the suggested GeOX glasses can be applied in different optical and radiation attenuation applications. [ABSTRACT FROM AUTHOR]

Published
2024
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