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Effect of Adding Two Intermediate Oxides (Bi2O3 and MnO2) in Place of a Glasss Original Oxide (B2O3) on the Structural, Optical, and Shielding Qualities of Several Sodium Borate-based Glasses |
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PP: 361-375 |
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doi:10.18576/isl/130214
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Author(s) |
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Hosam M. Gomaa,
H. A. Saudi,
A. M. Moneep,
A. A. Bendary,
Algendy S. Algendy,
Ahmed. M. Mabrouk,
Takwa E. Ellakwa,
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Abstract |
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| This work prepared a set of six samples of sodium borate glass containing different concentrations of bismuth and manganese cations using the rapid cooling method. In addition to molar volume calculations, measurements of density, X-ray patterns, and infrared spectra confirmed the amorphous nature of all samples and that the lower B2O3 content sample has the highest homogeneity of all samples. FTIR revealed many structural units throughout the glass networks, like BO3, BO4, BiO3, and BiO6. The replacement of B2O3 by both Bi2O3 and MnO forced BO3 units to convert to BO4 units, causing an increase in the number of nonbridging oxygen atoms. It also forces BiO3 units, which are glass network formers, to convert to BiO6 units, which act as glass network modifiers and occupy the interstitial vacancies. The replacement of B2O3 by both Bi2O3 and MnO caused an increase in the glass bulk density, the glass molar volume, the number of nonbridging oxygen atoms, and the density of the localized states. It also increased the values of the optical reflectance, absorption coefficient, refractive index, absorption index, and mass attenuation coefficient. On the other side, such a replacement caused a decrease in the values of the optical band gaps and the half-value layer. The study results suggest the investigated samples are perfect cathode glasses. It also nominates the sample with the lowest B2O3 content for gamma ray shielding applications and vice versa for neutrons.
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