Structural study of bismuth borosilicate, aluminoborate and aluminoborosilicate glasses by 11B and 27Al MAS NMR spectroscopy and thermal analysis

Khanna, Atul; Saini, Amanpreet; Chen, Banghao; González, Fernando; Pesquera, C.

doi:10.1016/j.jnoncrysol.2013.04.020

Cited by 46 publications

(20 citation statements)

References 35 publications

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“…BO 4 . 27,28 The decrease in nonbridging oxygen pushed the reaction to the left, which is in accordance with the 11 B NMR measurements. The results indicated the structure evolution from BO 4 to BO 3 units owing to the lack of the NBOs bonds.…”

Section: Resultssupporting

confidence: 87%

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Effect of the Glass Structure on Emission of Rare‐Earth‐Doped Borate Glasses

Jiao

Zhou

et al. 2015

J. Am. Ceram. Soc.

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A series of glasses composed of xB 2 O 3 -8Al 2 O 3 -(90 -x)Na 2 O-R 2 O 3 (x = 65, 70, 75, 80, 85; R = Dy 3+ , Tb 3+ , Sm 3+ ) were prepared through melt-quenching. Structural evolution was induced by varying the glass composition. Increasing the glass network former B 2 O 3 enhanced the luminescence of rare-earth ions, as observed in the emission spectra. The mechanism of the glass structural evolution was investigated by the NMR spectra analysis. The dispersant effect of the glass structure was believed to promote the better distribution of the rareearth ions in the matrix and reduced the concentration quenching between them. The relationship between the glass structure and its optical properties was established.

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Section: Resultssupporting

confidence: 87%

“…So the content of NBOs is little in the glass matrix. Moreover, there is interplay between oxygen and boron speciation that can be expressed by schematic reactions such as: BO 3 + NBO → BO 4 . The decrease in nonbridging oxygen pushed the reaction to the left, which is in accordance with the 11 B NMR measurements.…”

Section: Resultsmentioning

confidence: 99%

Effect of the Glass Structure on Emission of Rare‐Earth‐Doped Borate Glasses

Jiao

Zhou

et al. 2015

J. Am. Ceram. Soc.

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“…In previous related work, Morin et al have found that the glass transition temperature ( T g ) of modified SiO 2 –Al 2 O 3 –B 2 O 3 glasses with relatively small SiO 2 content is mostly controlled by modifier cation‐oxygen bond strength, and not to Al and B coordination . Besides, Khanna et al have shown that increase in silica concentration suppresses the concentration of five‐ and sixfold Al in bismuth aluminoborate glasses . In this study, we synthesize two glass series, in which we keep the Li/Al ratio constant.…”

Section: Introductionmentioning

confidence: 92%

“…28 Besides, Khanna et al have shown that increase in silica concentration suppresses the concentration of five-and sixfold Al in bismuth aluminoborate glasses. 29 In this study, we synthesize two glass series, in which we keep the Li/ Al ratio constant. This is done to keep the structural role of Al approximately constant, since it has a strong enthalpic preference for being charge stabilized by alkali cations (eg, Li + ) in tetrahedral configuration.…”

mentioning

confidence: 99%

Competitive effects of free volume, rigidity, and self‐adaptivity on indentation response of silicoaluminoborate glasses

et al. 2019

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Lithium aluminoborate glasses have recently been found to feature high resistance to crack initiation during indentation, but suffer from relatively low hardness and chemical durability. To further understand the mechanical properties of this glass family and their correlation with the network structure, we here study the effect of adding SiO2 to a 25Li2O–20Al2O3–55B2O3 glass on the structure and mechanical properties. Addition of silica increases the average network rigidity, but meanwhile its open tetrahedral structure decreases the atomic packing density. Consequently, we only observe a minor increase in hardness and glass transition temperature, and a decrease in Poisson's ratio. The addition of SiO2, and thus removal of Al2O3 and/or B2O3, also makes the network less structurally adaptive to applied stress, since Al and B easily increase their coordination number under pressure, while this is not the case for Si under modest pressures. As such, although the silica‐containing networks have more free volume, they cannot densify more during indentation, which in turn leads to an overall decrease in crack resistance upon SiO2 addition. Our work shows that, although pure silica glass has very high glass transition temperature and relatively high hardness, its addition in oxide glasses does not necessarily lead to significant increase in these properties due to the complex structural interactions in mixed network former glasses and the competitive effects of free volume and network rigidity.

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“…Figure shows first‐order and second‐order predictions vs actual properties for T g (Figure A,B) and T s , (Figure C,D). Also shown are comparisons of experimental T g data for similar compositions reported by other authors . Different R 2 values (insets of each plot) were used to evaluate the goodness of each fit to experimental data from the present work.…”

Section: Discussionmentioning

confidence: 91%

Viscosities and working region predictions for bismuth aluminoborosilicate glasses

Gardner

Riley

Elliott

et al. 2018

Int J of Appl Glass Sci

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Bismuth aluminoborosilicate glasses were prepared using a standard melt-quench technique, and the viscosity and thermal properties were measured and analyzed. Electron microprobe analysis was used to examine glass homogeneity. Fragility was calculated based on Mauro-Yue-Ellison-Gupta-Allan model fits to the viscosity curves. The system is characterized by an open structure with high fragility (44)(45)(46)(47)(48)(49)(50)(51)(52)(53)(54)(55)(56)(57)(58)(59). Based on microanalysis and differential scanning calorimetry results, the addition of network intermediate Al 2 O 3 appears to mitigate both phase separation and crystallization. From thermal property data, mixture models were created to predict the glass transition temperatures and softening temperatures as functions of composition. Based on K-fold validation findings, the first-order mixture model predictions of glass transition and softening appear to approximate actual values better than models with any additional second-order terms.

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Structural study of bismuth borosilicate, aluminoborate and aluminoborosilicate glasses by 11B and 27Al MAS NMR spectroscopy and thermal analysis

Cited by 46 publications

References 35 publications

Effect of the Glass Structure on Emission of Rare‐Earth‐Doped Borate Glasses

Effect of the Glass Structure on Emission of Rare‐Earth‐Doped Borate Glasses

Competitive effects of free volume, rigidity, and self‐adaptivity on indentation response of silicoaluminoborate glasses

Viscosities and working region predictions for bismuth aluminoborosilicate glasses

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