Investigation of alumino-silicate glasses by coupling experiments and simulations: Part I - Structures

Delaye, Jean‐Marc; Gac, A. Le; Macaluso, S.; Angeli, Frédéric; Lodesani, Federica; Charpentier, Thibault; Peuget, S.

doi:10.1016/j.jnoncrysol.2021.120936

Cited by 7 publications

(2 citation statements)

References 55 publications

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“…Raman spectra can be analyzed through two different regions: the high-frequency region (800-1200 cm À1 ) and the low-frequency region (500-800 cm À1 ). [27] Raman bands in 650-750 cm À1 are more controversial. Some studies believe that this region is the frequency of bending vibrations of the bridging oxygen bonds of Si─O, [28,29] while others believe that it corresponds to the stretching vibrations of Al-O 0 in [AlO 4 ] À tetrahedral units.…”

Section: Effect Of Cr 2 O 3 On the Structure Of Molten Slagmentioning

confidence: 99%

Effect of Cr₂O₃ Content on the Viscosity and Crystallization Properties of Continuous Casting Mold Slag

Chen

Wang

et al. 2023

steel research int.

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Herein, the effect of Cr2O3 on the crystallization and flow behavior of CaO–SiO2–Al2O3–Na2O–CaF2 continuous casting mold slags is investigated. The viscosity in the slag at 1200–1500 °C is measured by the rotating cylinder method and a quantitative relationship between the viscosity and the Raman structure Q3/Q2 is constructed. The time–temperature–transformation and continuous cooling transformation diagrams for various slags are obtained using a single hot‐thermocouple technique. The results show that with the crystallization temperature decreases, it can be observed that the crystal growth mode gradually changes from 3D spherical and 2D massive to 1D needle‐like. The study finds the transition from network modifier to network forming agent in the slag for Cr2O3 content from 0 to 3 wt%. The Cr2O3 added to 1–2 wt% decreases the viscosity and promotes crystallization. The viscosity increases and the crystallization is inhibited when the content of Cr2O3 increases to 3 wt%. Meanwhile, when Cr2O3 is added to 3 wt%, the Cr2O3 crystalline phase precipitates except for the main crystalline phase 2CaO·SiO2.

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Section: Effect Of Cr 2 O 3 On the Structure Of Molten Slagmentioning

confidence: 99%

Effect of Cr₂O₃ Content on the Viscosity and Crystallization Properties of Continuous Casting Mold Slag

Chen

Wang

et al. 2023

steel research int.

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“…This is because the presence Al2O3 can form interconnected bonds in glass systems, leading to an improvement in the chemical stability [5] and good mechanical properties [6,7]. Physical properties of Al2O3containing glasses, such as micro-hardness, conductivity, and chemical durability, are strongly linked to their Al coordination, which changes from six (AlO6) to five (AlO5) to four (AlO4) coordination [7][8][9][10]. Then, for adjustments of the structure to get appropriate physical properties, it is important to control both the boron and aluminum coordinations in the investigated glasses.…”

Section: Introductionmentioning

confidence: 99%

Effect of aluminum oxide on the structure and conduction behaviors of silver borate glasses

Damrawi¹,

Abdelghany²,

Salaheldin³

2022

Bull. Chem. Soc. Eth.

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ABSTRACT. The current study focuses on glass preparation and characterization in the glass system of chemical formula xAl2O3 (35-x) Ag2O.65B2O3 (0≤x≤35 mol%), where Ag2O is replaced with Al2O3. To examine a wide range of both structure and morphology of the prepared glasses, nuclear magnetic resonance (NMR) of 27Al nuclei, X-ray diffraction (XRD) spectroscopy, and transmission electron microscopy (TEM) are used. In Al2O3-rich glass, the well-formed AlO6, AlO5, and AlO4 structural groups are the well-formed units. In samples of (20 and 30 mol % Al2O3), tetrahedral AlO4 and traces from AlO6 units could be detected. At lower concentrations of Al2O3 (10 mol%), the dominant forming unit is only AlO4 groups containing non-bridging oxygen bonds (NBO). The XRD spectra confirm the amorphous nature of the glasses of Al2O3 ˂20 mol% while glasses of higher Al2O3 concentrations contain crystalline Ag2Al2B2O7 formed due to the higher oxygen packaging of the mixed AlO5 and AlO4 compared with that of glasses containing only AlO4 species only. The morphology of crystalline units is confirmed from TEM to differ from that of an amorphous composition. The increase of activation energy and the hardness number of the glasses led to an increase in the durability of the investigated glasses. KEY WORDS: Aluminum borate glass, NMR, Coordination of aluminum atom, Conductivity, Crystallization process Bull. Chem. Soc. Ethiop. 2022, 36(3), 597-606. DOI: https://dx.doi.org/10.4314/bcse.v36i3.9

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Bi Cluster Engineering for Tunable Broadband NIR Optical Response

Chen,

Dong,

Liu

et al. 2024

Adv Funct Materials

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Near‐infrared (NIR) broadband active photonic materials play a crucial role in various domains such as optical communication, phototherapy, and medical imaging. However, the construction of NIR photonic materials with tunable optical response still remains a great challenge. This manuscript proposes a topological structure engineering strategy in Bi‐activated glass for the realization of the controllable NIR emission. By manipulating the topological structure of glass, the Bi cluster configuration can be precisely control, with the cluster size from 2.78 to 1.64 nm. Correspondingly, various optical properties including broadband emission, excited state absorption (ESA), and even unsaturable loss (UL) can be rationally switched. Based on the above findings, Bi cluster‐activated bulk glasses, optical fibers, and the derived NIR active devices with notably improved performance can be successfully fabricated. Their application potentials in optical communication and NIR imaging are also demonstrated. The study highlights the promise of Bi cluster‐activated materials in advancing NIR photonic materials and devices. Furthermore, the topological‐mediated cluster regulation strategy may also provide new insights into the fundamental science and cutting technology of other cluster‐activated materials.

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Investigation of alumino-silicate glasses by coupling experiments and simulations: Part I - Structures

Cited by 7 publications

References 55 publications

Effect of Cr₂O₃ Content on the Viscosity and Crystallization Properties of Continuous Casting Mold Slag

Effect of Cr₂O₃ Content on the Viscosity and Crystallization Properties of Continuous Casting Mold Slag

Effect of aluminum oxide on the structure and conduction behaviors of silver borate glasses

Bi Cluster Engineering for Tunable Broadband NIR Optical Response

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Investigation of alumino-silicate glasses by coupling experiments and simulations: Part I - Structures

Cited by 7 publications

References 55 publications

Effect of Cr2O3 Content on the Viscosity and Crystallization Properties of Continuous Casting Mold Slag

Effect of Cr2O3 Content on the Viscosity and Crystallization Properties of Continuous Casting Mold Slag

Effect of aluminum oxide on the structure and conduction behaviors of silver borate glasses

Bi Cluster Engineering for Tunable Broadband NIR Optical Response

Contact Info

Product

Resources

About

Effect of Cr₂O₃ Content on the Viscosity and Crystallization Properties of Continuous Casting Mold Slag

Effect of Cr₂O₃ Content on the Viscosity and Crystallization Properties of Continuous Casting Mold Slag