Composition-structure-property relationships in Li2O–Al2O3–B2O3 glasses

Fernandes, Hugo R.; Kapoor, Saurabh; Patel, Yoami; Ngai, Kimberly; Levin, Kirill; Germanov, Yaroslav; Krishtopa, Larisa G.; Kroeker, Scott; Goel, Ashutosh

doi:10.1016/j.jnoncrysol.2018.08.005

Cited by 28 publications

(8 citation statements)

References 44 publications

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“…The high ionic field strength cations, for example, Mg 2+ , Ca 2+ , and rare-earths (RE 3+ )-hereafter referred as M n+ -when substituted for Na + in the glass structure are known to (1) create highly charged NBOs in silicate and/or borate regions (depending on the glass chemistry) resulting in the formation of M n+ -NBO-enriched regions; 16,53 (2) facilitate the conversion of BO 4 to BO 3 by promoting the concentration of negative charges on NBOs in their local coordination environment; 16,17,19 and (3) promote the formation of AlO 5 units. 16,54 Thus, the increase in T g of glasses with increasing Ca 2+ /Na + may be attributed to the increas-ing rigidity of the glass network owing to the formation of (1) stronger Ca 2+ -NBO bonds compared to weaker Na + -NBO bonds, and (2) highly coordinated aluminum species in the glass structure. Similar trends with respect to an increase in T g with increasing concentration of M n+ -NBO regions (in glasses comprising high field strength cations) and five-coordinated aluminum have been widely reported in the literature.…”

Section: Compositional and Structural Dependence Of Glass Transitionmentioning

confidence: 99%

Impact of non‐framework cation mixing on the structure and crystallization behavior of model high‐level waste glasses

et al. 2022

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Spinel crystallization is known to be detrimental to the operation of Joule heated ceramic melters during the vitrification of iron-rich high-level nuclear wastes (HLW) into borosilicate glasses. The literature on this subject focuses on tackling the problem by developing empirical constraints to design compositions, which limit the fraction of spinels formed in the melter or by developing empirical models to predict the settling behavior of spinels in the melter as a function of the glass composition. While these empirical models can predict the behavior of most of the compositions, they are not failsafe as there are always some compositions, whose behavior is beyond the predictive ability of these models. This can lead to undesirable situations during the vitrification of the nuclear waste, and therefore an in-depth investigation of the chemo-structural descriptors controlling the crystallization behavior in these glasses is warranted. Accordingly, the present study aims to understand the impact of non-framework cation mixing (i.e., Li + /Na + and Ca 2+ /Na + ) on the structure (through Raman spectroscopy and Mössbauer spectroscopy) and crystallization behavior (through XRD, SEM-EDS, and vibrating sample magnetometry) of iron-rich model HLW glasses in the system: (mol.%) x M y O-(25−x) Na 2 O-9.12 B 2 O 3 -6.4 Al 2 O 3 -51.25 SiO 2 -7.22 Fe 2 O 3 -0.38 MnO-0.08 Cr 2 O 3 -0.55NiO (M y O = Li 2 O or CaO).

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Section: Compositional and Structural Dependence Of Glass Transitionmentioning

confidence: 99%

Impact of non‐framework cation mixing on the structure and crystallization behavior of model high‐level waste glasses

et al. 2022

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“…Different glass hosts such as borate, phosphate, germanite, vanadate, and tellurite families have been extensively studied for this objective. 5 Among these families, borate glasses are preferred in certain optical, optoelectronic and photonic devices mainly owing to their (i) low working temperatures, (ii) wide glass forming range, (iii) second-and third-order optical non-linearity 6 and borate glasses are most consistent for high concentrations of transition metal and rare earth ion doping. 7 The borate glasses modified by various constituents such as alkali oxide, alkaline-earth oxide, aluminum oxide, fluorides, and heavy metal oxides have the advantages of high transparency, high thermal stability, low phonon energy compared to that of pure borate glass, which is high (1400 cm −1 ).…”

Section: Introductionmentioning

confidence: 99%

“…Fig 6. The determination of the phonon energy from absorption spectrum of the different glass structure with different molar percentages of MgF 2 .…”

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confidence: 99%

Magnesium Fluoride Borate Glasses for Low Phonon Energy

Abdel-Baki

Mostafa

Azooz

et al. 2022

J. Electron. Mater.

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An oxyflouroborate glass series of composition 75B2O3-5Al2O3–(20-x) Li2O–xMgF2 (where x = 0, 5, 10, and 15 mol.%) was prepared using the normal melt-quenching technique. The physical properties (density, molar volume, and different optical behaviors) of the glass system were investigated via different techniques and discussed with the substitution of Li2O for MgF2. Also, the absorption coefficient, both direct and indirect optical energy gaps, and the optical exciton energy gap were studied. Furthermore, IR spectroscopy was used as a structural probe of the nearest-neighbor environment in the glass network. The results elucidate that the replacement of Li2O with MgF2 leads to both a blueshift in absorption cutoff and a decrease in the direct energy gap. More liberation of Mg+2 ions produces more localized states during transition, which decreases the values of band gap energy. The addition of MgF2 has a clear impact on lowering the glass phonon energy, which makes this glass promising for fiber amplifiers that operate at certain telecommunications wavelength bands and for upconversion fiber lasers. These results show the capability of using oxyflouroborate glass series to be applicable in optical amplifier laser components.

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“…Furthermore, the separation of nanostructured materials from aqueous solutions is quite challenging, especially when the particle size is on the nano-scale. Researchers are currently concentrating on methods of employing nano-powder metal oxides to remove heavy metal ions [22][23][24]. One method is to incorporate nanoparticles into an organic substance, which could be represented by an optimum solution such as a polymer matrix structure.…”

Section: Introductionmentioning

confidence: 99%

Removal of Ni(II) Ions by Poly(Vinyl Alcohol)/Al2O3 Nanocomposite Film via Laser Ablation in Liquid

et al. 2022

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Al2O3-poly(vinyl alcohol) nanocomposite (Al2O3-PVA nanocomposite) was generated in a single step using an eco-friendly method based on the pulsed laser ablation approach immersed in PVA solution to be applicable for the removal of Ni(II) from aqueous solution, followed by making a physicochemical characterization by SEM, XRD, FT-IR, and EDX. After that, the effect of adsorption parameters, such as pH, contact time, initial concentration of Ni(II), and medium temperature, were investigated for removal Ni(II) ions. The results showed that the adsorption was increased when pH was 5.3, and the process was initially relatively quick, with maximum adsorption detected within 90 min of contact time with the endothermic sorption process. Moreover, the pseudo-second-order rate kinetics (k2 = 9.9 × 10−4 g mg−1 min−1) exhibited greater agreement than that of the pseudo-first-order. For that, the Ni(II) was effectively collected by Al2O3-PVA nanocomposite prepared by an eco-friendly and simple method for the production of clean water to protect public health.

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Composition-structure-property relationships in Li2O–Al2O3–B2O3 glasses

Cited by 28 publications

References 44 publications

Impact of non‐framework cation mixing on the structure and crystallization behavior of model high‐level waste glasses

Impact of non‐framework cation mixing on the structure and crystallization behavior of model high‐level waste glasses

Magnesium Fluoride Borate Glasses for Low Phonon Energy

Removal of Ni(II) Ions by Poly(Vinyl Alcohol)/Al2O3 Nanocomposite Film via Laser Ablation in Liquid

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