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168 results on '"Shams, M. S."'

40. Borosilicate glasses doped with Er2O3: preparation, physical, optical, dielectric properties and radiation shielding capacity.

Author

Almuqrin, Aljawhara, Al-Otaibi, Jamelah S., Alwadai, Norah, Albarzan, Badriah, Elsad, R. A., Shams, M. S., and Rammah, Yasser S.

Subjects
BOROSILICATES, MASS attenuation coefficients, RADIATION shielding, MOLECULAR volume, DIELECTRIC properties
Abstract

This study aimed to investigate the physical, optical, dielectric properties as well as gamma-ray shielding capacity of borosilicate glass samples with chemical formula 70B2O3–5SiO2–10Li2O–5Bi2O3–10ZnO–XEr2O3 with X = 0.0 (Er-0.0) to 1.2 (Er-1.2) mol% which prepared by the melt quenching technique method. Densities (Ds) of Er-X samples increased from 2.95 to 3.12 g/cm3, whereas the molar volume (Vm) declined from 30.68 to 30.50 cm3/mol as Er2O3 content increased from 0.0 to 1.2 mol%. The oxygen packing density (OPD) enhanced from 89.64 to 90.33 mol/l, whereas oxygen molar volume (OMV) decreased from 11.16 to 10.95 cm3/mol. The optical band gap decreased from 3.36 to 2.90 eV for direct transition, while decreased from 2.96 to 2.50 eV for indirect transition. Urbach energy (ΔEu) was enhanced from 0.17 to 0.56 eV. The refractive index (n) was increased from 2.40 to 2.54. The dielectric constant regularly rises with increasing Er2O3 content in the glass networks. The mass attenuation coefficient (MAC) followed the trend as (Er-1.2)MAC > (Er-0.9)MAC > (Er-0.6)MAC > (Er-0.3)MAC > (Er-0.0)MAC. The Er-1.2 sample possessed the lowest values of half value layer (HVL) and mean free path (MFP). Results showed that suggested Er-X glasses, can be used in optical and radiation shielding applications. [ABSTRACT FROM AUTHOR]

Published
2024
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44. Sodium Fluoroborate Glass Loaded with Fixed CoO and Variable La2O3: Fabrication, Physical, FTIR, and Dielectric Characteristics: Sodium Fluoroborate Glass Loaded with Fixed CoO and Variable La2O3: Fabrication, Physical, FTIR...: N. Alfryyan et al

Author

Alfryyan, Nada, Al-Ghamdi, Hanan, Alsaif, Norah A. M., Shaaban, Shaaban M., Shams, M. S., El-Refaey, Adel M., Elsad, R. A., Abdelghany, A. M., Abouhaswa, A. S., Mesalam, Yehya I., and Rammah, Yasser S.

Subjects
ELECTRONIC packaging, MOLECULAR volume, PERMITTIVITY, X-ray diffraction, ELECTRONIC materials
Abstract

Base and glass samples with nominal compositions 65B2O3-15NaF-15ZnO-5Bi2O3-0.25CoO-XLa2O3 with X = 0.0–0.6 mol% were produced using the melt quenching technique. The nature of the samples, and the physical, FTIR, and dielectric characteristics were investigated. The XRD data confirmed the non-crystalline state of samples. The density (Ds) of the base and La-X glasses was varied from 3.10 g cm−3 to 3.42 g cm−3. The molar volume (Vm) was decreased from 28.05 cm3/mol to 26.46 cm3/mol. Values of the oxygen molar volume (OMV) declined from 12.47 cm3/mol to 11.83 cm3/mol. The oxygen packing density (OPD) increased from 80.20 g atm l−1 to 84.52 g atm l−1. The FTIR measurements confirmed that incorporation of CoO and La2O3 caused an increased conversion of BO3 to BO4, which caused NBOs to decline and vanish throughout this process. All the glasses under consideration, which were loaded with various quantities of lanthanum (La2O3) and a constant amount of cobalt (CoO), showed a considerable decrease in dielectric constant (ε′) as the frequency rose throughout the low-frequency band. The ε′ decreased dramatically with the addition of CoO. Then, it decreased more when La2O3 was added, achieving 0.4 mol% at the constant amount of CoO. Among the examined samples, the glass sample (La-0.4) loaded with 0.25 mol% of CoO and 0.4 mol% of La2O3 is thought to be promising material for electronic packaging since it has the fastest transmission speed and the lowest dielectric constant. [ABSTRACT FROM AUTHOR]

Published
2025
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48. The impact of V2O5 on structure, dielectric, and radiation-shielding characteristics of borate-lead-fluoride glasses.

Author

Al Huwayz, Maryam, Almuqrin, Aljawhara H., Shaaban, Shaaban M., Mesalam, Yehya I., Rammah, Y. S., Shams, M. S., Kotb, S. M., Talaat, S., and Elsad, R. A.

Subjects
ATTENUATION coefficients, PERMITTIVITY, BORATE glass, VANADIUM oxide, FUNCTIONAL groups, RADIATION shielding
Abstract

The effect of vanadium oxide (V2O5) on the structural, dielectric, and shielding features of borate-lead-fluoride glasses was investigated. The density of the glass network increased steadily from 3.18 to 3.28 g.cm−3 as the vanadium content increased from 0.0 to 10 mol%. The evolution of functional groups and units such as non-bridging BO3, and bridging BO4, in our newly developed glasses was exposed by FTIR analysis. Since the fraction of bridging units BO4 increases when V2O5 is added up to 2 mol%. This indicates that the conversion of BO3 groups into BO4 groups is facilitated by V2O5. However, at higher concentrations of V2O5 (> 2 mol%), a reversal reaction occurs wherein the BO3 unit fraction increases and the BO4 unit fraction starts to decrease. All the glasses loaded with different amounts of V2O5 mol% had a sharp decline in dielectric constant with increasing frequency over the low frequency interval. As the V2O5 level grew up to 2 mol%, the dielectric constant value was marginally reduced and then increased for higher concentrations. All of the glasses under examination displayed different relaxation peaks in the range of 100 Hz to 20 kHz on their measured loss tangent (tan δ), but vanadium doping caused them to shift to higher frequencies. At 0.015 MeV, the maximum MAC values for the V-0.0 to V-10.0 samples were found to be 29.205 cm2/g to 30.082 cm2/g. In terms of radiation shielding, the V-10.0 sample exhibited the highest values of mass (MAC) and linear (LAC) attenuation coefficients, while the same sample possessed the lowest values of half value layer and mean free path among all investigated glasses. Therefore, the investigate glass can be used in several optical and radiation shielding applications. [ABSTRACT FROM AUTHOR]

Published
2024
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