A critical evaluation of barium silicate glass network polymerization

Moulton, Benjamin J.A.; Picinin, A.; Silva, Laís D.; Doerenkamp, Carsten; Lozano, Harold; Sampaio, D.V.; Zanotto, Edgar Dutra; Du, Jincheng; Eckert, Hellmut; Pizani, P. S.

doi:10.1016/j.jnoncrysol.2022.121477

Cited by 14 publications

(4 citation statements)

References 106 publications

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“…The spectral shape is similar in all glasses and no significant change is observed with the addition of Li 2 O. The Q n structure found in barium silicate glasses 32 is mainly formed by the Q 2 structure at 940 cm −1 and the Q 3 structure at 1080 cm −1 . Figure 5 shows the effect of heat treatment time on Raman spectra of LBS0 and LBS0.2.…”

Section: Resultsmentioning

confidence: 65%

Effect of small additions of Li₂O on phase separation and crystallization of barium‐silicate glasses

Kajihara

Akatsuka²,

Hijiya³

et al. 2023

J Am Ceram Soc.

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It is known that the addition of Li 2 O to 33.3BaO-66.7SiO 2 glass, whose composition is the same as BaSi 2 O 5 , promotes crystallization of BaSi 2 O 5 . In this study, in order to clarify the effect of a smaller amount of Li 2 O, xLi 2 O-(30-x)BaO-70SiO 2 [mol%] (x = 0, 0.2, 0.5) glasses were prepared. The main crystalline phases in the heat treatments near the maximum crystallization peak temperature, were high-BaSi 2 O 5 and low-BaSi 2 O 5 which transformed from high-BaSi 2 O 5 . It is found that the introduction of only 0.2 mol% and 0.5 mol% Li 2 O significantly changes the crystallization behavior. In the composition without Li 2 O, only high-BaSi 2 O 5 was formed after heat treatment even for 24 h. For compositions containing Li 2 O, low-BaSi 2 O 5 was formed within 1 h of heat treatment. In these compositions, it is found that the addition of Li 2 O enhances phase separation in the early stage of heat treatment, resulting in the formation of Si-rich droplet phases and Ba-rich phases. The composition of the Ba rich glass phase would be close to the stoichiometric composition of BaSi 2 O 5 , suggesting a significant change in crystallization behavior.

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Section: Resultsmentioning

confidence: 65%

Effect of small additions of Li₂O on phase separation and crystallization of barium‐silicate glasses

Kajihara

Akatsuka²,

Hijiya³

et al. 2023

J Am Ceram Soc.

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“…The growth of one phase involves the diffusion of a species into or out of the other phase. In binary modified silicates, the reaction 2Q 3 → Q 2 + Q 4 has been shown to accompany modifier diffusion during the initial stages of phase separation and results in the formation of silica‐rich and silica‐poor regions 7,31,32 . This reaction also conserves the number of non‐bridging oxygens (NBOs) and implies that NBOs become heterogeneously distributed due to diffusion of the modifiers rather than individual Q n units.…”

Section: Discussionmentioning

confidence: 99%

“…In binary modified silicates, the reaction 2Q 3 → Q 2 + Q 4 has been shown to accompany modifier diffusion during the initial stages of phase separation and results in the formation of silica-rich and silica-poor regions. 7,31,32 This reaction also conserves the number of non-bridging oxygens (NBOs) and implies that NBOs become heterogeneously distributed due to diffusion of the modifiers rather than individual Q n units. Therefore, glasses that phase separate through this reaction typically have the same total number of NBOs as their homogenous counterpart.…”

Section: Effect Of Treatment Time On H Vmentioning

confidence: 99%

Mechanisms of microstructural deformation governing Vickers hardness in phase‐separated calcium aluminosilicate glasses

2023

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The impact of microstructure on hardness in phase‐separated calcium aluminosilicate glasses is investigated. Changes in hardness are governed by microstructure deformations that occur during indentation. Phase separation leads to decreased hardness due to the incongruent yielding of the droplet and matrix phases. Moreover, the deformation of microstructures possessing dilute, spherical droplets did not have a significant impact on hardness. Microstructures characterized by concentrated, acicular droplets were found to deform through a process of droplet coalescence. This process absorbs additional energy during yielding and results in glasses that deform through droplet coalescence possessing improved hardness.

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“…The properties of silicate glasses is the well-studied topic as there is a huge amount of literature dealing with various aspects of silicate glasses, their properties and applications [1,2]. Since the silicate glass is frequently used material in many industrial and special applications, it was studied in detail by a number of proven techniques and methods like scanning electron microscopy (SEM/ STEM), electron probe microanalysis (EPMA), Auger electron spectroscopy (AES), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), nuclear magnetic resonance (NMR), molecular dynamics simulations (MD), just to name a few [3][4][5][6][7][8][9][10][11]. Hence, silicate glass is the thoroughly studied topic as numerous glass systems of various composition were characterized by the previously mentioned microscopic and spectroscopic methods.…”

Section: Introductionmentioning

confidence: 99%

The Chemical Analysis of Differently Prepared Glass Surfaces - The Comparison Between Edx and XRF

Gavenda¹

2022

Ceramics - Silikaty

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Two sets of model glasses differing by molar fractions of bridging (BO) and non-bridging (NBO) oxygens and of Q 3 and Q 4 structural units were prepared. Glasses in each set are isostructural on BO/NBO level that means the fractions of BO and NBO are the same. The groups mimic Float glass and the commercial barium crystal glass. The study compares three different ways of glass surface preparation in order to find the most realistic results of chemical analyses. The studied surfaces were: i) the original surface created by melting and exposed to the ambient atmosphere, ii) polished sample routinely prepared in way common for X-ray microanalysis, and iii) freshly fractured surface. Glasses were also analysed by XRF and the results were compared with the EDX analysis. The data suggest the EDX analysis of fresh fractures provide the most realistic composition. The comparison of XRF and EDX provide useful insight into the differences between two methods and further enhances the complexity of the glass surface study. While XRF offers a reliable analysis of bigger volume and provides averaged composition, EDX yields a more realistic surface and local composition. EDX of freshly prepared fractures revealed strong sodium enrichment on the surface due to the active participation of this element in the relaxation of the newly formed surface.

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A critical evaluation of barium silicate glass network polymerization

Cited by 14 publications

References 106 publications

Effect of small additions of Li₂O on phase separation and crystallization of barium‐silicate glasses

Effect of small additions of Li₂O on phase separation and crystallization of barium‐silicate glasses

Mechanisms of microstructural deformation governing Vickers hardness in phase‐separated calcium aluminosilicate glasses

The Chemical Analysis of Differently Prepared Glass Surfaces - The Comparison Between Edx and XRF

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A critical evaluation of barium silicate glass network polymerization

Cited by 14 publications

References 106 publications

Effect of small additions of Li2O on phase separation and crystallization of barium‐silicate glasses

Effect of small additions of Li2O on phase separation and crystallization of barium‐silicate glasses

Mechanisms of microstructural deformation governing Vickers hardness in phase‐separated calcium aluminosilicate glasses

The Chemical Analysis of Differently Prepared Glass Surfaces - The Comparison Between Edx and XRF

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Product

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Effect of small additions of Li₂O on phase separation and crystallization of barium‐silicate glasses

Effect of small additions of Li₂O on phase separation and crystallization of barium‐silicate glasses