Spectroscopic study of the role of alkaline earth oxides in mixed borate glasses - site basicity, polarizability and glass structure

Othman, H. A.; Elkholy, Hagar; Cicconi, Maria Rita; Πάλλες, Δ.; Ligny, Dominique de; Kamitsos, E. I.; Möncke, Doris

doi:10.1016/j.jnoncrysol.2020.119892

Cited by 36 publications

(18 citation statements)

References 39 publications

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“…It is well recognized that the probe ion method embodies the optical basicity based on the nephelauxetic effect, meaning the conversion into numerical values. However, it should be pointed out that probe ions used in the method might generate new structural sites being not typical (average) for the given medium 26–30 . For example, Klein and Onorato 26 reported the values of Λ = 0.577 for Pb 2+ probe ion and Λ = 0.530 for Bi 3+ probe ion in 20Na 2 O–20CaO–60SiO 2 glass, suggesting that Pb 2+ and Bi 3+ probe ions might be present at different local environments in the glass.…”

Section: Methodsmentioning

confidence: 99%

“…It should be pointed out that these values are much smaller compared with the value of Λ (n o ) = 0.633 obtained using the Lorentz-Lorenz formula method (Table 8). Mőncke et al 28,30 reported the value of Λ = 0.64 for Mn 2+ probe ion in 16Na 2 O-10CaO-74SiO 2 glass. They also reported the value of the theoretical optical basicity Λ th = 0.57 using the values of Λ(Na 2 O) = 1.15, Λ(CaO) = 1.00, and Λ(SiO 2 oxide) = 0.48 and suggested that the value of Λ = 0.64 for Mn 2+ -site basicity (local basicity) is higher than the theoretical optical basicity of Λ th = 0.57.…”

Section: Ternary Silicate Glassesmentioning

confidence: 99%

“…[26][27][28][29][30] For example, Klein and Onorato 26 reported the values of Λ = 0.577 for Pb 2+ probe ion and Λ = 0.530 for Bi 3+ probe ion in 20Na 2 O-20CaO-60SiO 2 glass, suggesting that Pb 2+ and Bi 3+ probe ions might be present at different local environments in the glass. Mőncke et al 28,30 have used Mn 2+ ions as a probe ion for the optical basicity of glasses, and for example, the values of Λ = 0.64 for Mn 2+ probe ion and Λ = 0.54 for Pb 2+ probe ion in 16Na 2 O-10CaO-74SiO 2 glass are obtained. Of course, it should be pointed out that the probe ion method is the original technique for the realization of the concept of optical basicity and an excellent technique for getting information on the electronic polarizability of local sites and also glass structure.…”

Section: Introductionmentioning

confidence: 99%

“…However, it should be pointed out that probe ions used in the method might generate new structural sites being not typical (average) for the given medium. [26][27][28][29][30] For example, Klein and Onorato 26 reported the values of Λ = 0.577 for Pb 2+ probe ion and Λ = 0.530 for Bi 3+ probe ion in 20Na 2 O-20CaO-60SiO 2 glass, suggesting that Pb 2+ and Bi 3+ probe ions might be present at different local environments in the glass. Mőncke et al 28,30 have used Mn 2+ ions as a probe ion for the optical basicity of glasses, and for example, the values of Λ = 0.64 for Mn 2+ probe ion and Λ = 0.54 for Pb 2+ probe ion in 16Na 2 O-10CaO-74SiO 2 glass are obtained.…”

Section: Introductionmentioning

confidence: 99%

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Electronic polarizability in silicate glasses by comparison of experimental and theoretical optical basicities

Komatsu

Dimitrov

Tasheva

et al. 2021

Int J of Appl Glass Sci

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The concept of optical basicity proposed by Duffy has been recognized as an extremely important issue in science and technology of glasses. In this article, the refractive index (n o )-based optical basicity Λ(n o ) of some binary and ternary silicate glasses was evaluated using the Lorentz-Lorenz formula, and the discrepancy between the values of Λ(n o ) and the theoretically calculated optical basicity Λ th was analyzed to understand more deeply the electronic polarizability in binary and ternary silicate glasses. A suitable value of the optical basicity for each oxide predicting a good quantitative composition dependence of optical basicity in a given glass system was proposed. The suitable value of SiO 2 for the prediction of the optical basicity of silicate glasses is Λ(SiO 2 glass) = 0.53, which is larger than the value of Λ(SiO 2 oxide) = 0.48 being used in the calculation of Λ th so far. Other suitable values such as Λ(Al 2 O 3 glass) = 0.62 and Λ(TiO 2 glass) = 1.04 were proposed. The relationship between the optical basicity and coordination structure in some oxides in silicate glasses was discussed.

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Section: Methodsmentioning

confidence: 99%

Section: Ternary Silicate Glassesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electronic polarizability in silicate glasses by comparison of experimental and theoretical optical basicities

Komatsu

Dimitrov

Tasheva

et al. 2021

Int J of Appl Glass Sci

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“…As the content of Samarium (III) ox in the solution increases, α value decreases, and the edges become extremely energized. The extinction coefficient can be determined using (k) that is increasing exponentia [28]: The extinction coefficient can be determined using (k) that is increasing exponentially [28]:…”

Section: Investigations On Optical Propertiesmentioning

confidence: 99%

Exploring the FTIR, Optical and Nuclear Radiation Shielding Properties of Samarium-Borate Glass: A Characterization through Experimental and Simulation Methods

et al. 2021

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(Tl2O3)30-(Li2O)10-(B2O3)(60−y)-(Sm2O3)y glass system with various Sm2O3 additives (y = 0, 0.2, 0.4, 0.6) was studied in detail. The vibrational modes of the (Tl2O3)30-(Li2O)10-(B2O3)(60−y) network were active at three composition-related IR spectral peaks that differed from those mixed with Samarium (III) oxide at high wavenumber ranges. These glass samples show that their permeability increased with the Samarium (III) oxide content increase. Additionally, the electronic transition between localized states was observed in the samples. The MAC, HVL, and Zeff values for radiation shielding parameters were calculated in the energy range of 0.015–15 MeV using the FLUKA algorithm. In addition, EBF, EABF, and ΣR values were also determined for the prepared glasses. These values indicated that the parameters for shielding (MAC, HVL, Zeff, EBF, EABF, and ΣR) are dependent upon the Samarium (III) oxide content. Furthermore, the addition of Samarium (III) oxide to the examined glass samples greatly reinforced their shielding capacity against gamma photon. The findings of the current study were compared to analyses of the XCOM software, some concretes, and lead. In the experiment, it was found that the SMG0.6 glass sample was the strongest shield.

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Structural and optical properties of mixed alkaline earth fluoroborate xBaF2–(50–x)CaF2–50B2O3 glass system

2022

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Spectroscopic study of the role of alkaline earth oxides in mixed borate glasses - site basicity, polarizability and glass structure

Cited by 36 publications

References 39 publications

Electronic polarizability in silicate glasses by comparison of experimental and theoretical optical basicities

Electronic polarizability in silicate glasses by comparison of experimental and theoretical optical basicities

Exploring the FTIR, Optical and Nuclear Radiation Shielding Properties of Samarium-Borate Glass: A Characterization through Experimental and Simulation Methods

Structural and optical properties of mixed alkaline earth fluoroborate xBaF2–(50–x)CaF2–50B2O3 glass system

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