Density–structure relations in mixed-alkali borosilicate glasses by 29Si and 11B MAS–NMR

Roderick, Jonathan M.; Holland, Diane; Howes, A. P.; Scales, Charlie R.

doi:10.1016/s0022-3093(01)00784-0

Cited by 38 publications

(46 citation statements)

References 8 publications

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“…If we suppose that the 1st (sub)peak centred at 1.40 Å is formed completely by [3] B units, even then about 30% of the 3-coordinated boron atoms contribute to the 2nd (sub)peak centred at 1.60 Å in addition to the number of [4] B units. From these findings we suppose that the boron atoms partly form a mixed continuous network with Si-O network, where several different mixed [4] B-O-Si and [3] B-O-Si linkages are present, in accordance with the findings of NMR [8,9] and Raman spectroscopy [11].…”

Section: Discussionsupporting

confidence: 86%

“…Structural characterization of these host glasses is essential for understanding of glass durability. Although several methods, like neutron and X-ray diffraction [2][3][4][5][6][7], NMR [8,9], X-ray absorption near edge structure (XANES) [10], and Raman scattering [11] proved to be successful tools to obtain information on the network structure of glassy systems, our knowledge on the multi-component glasses is very limited, so far. Due to the high number of contributing elements and the overlapping distances, it is very difficult to derive adequate structural data from diffraction experiments.…”

Section: Introductionmentioning

confidence: 99%

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Network structure of multi-component sodium borosilicate glasses by neutron diffraction

Fábian

Sváb

Mészáros

et al. 2007

Journal of Non-Crystalline Solids

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Section: Discussionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Network structure of multi-component sodium borosilicate glasses by neutron diffraction

Fábian

Sváb

Mészáros

et al. 2007

Journal of Non-Crystalline Solids

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“…Scientist and engineers use model systems to understand the key components of the more complex glasses [92][93][94]. Many model systems contain three oxides [60,[95][96][97][98][99][100][101][102], two formers and one modifier. In this spirit, the balance of this review is devoted to ternary glass systems.…”

Section: Basic Chemical Composition Of Oxide Glassesmentioning

confidence: 99%

Recent progress to understand stress corrosion cracking in sodium borosilicate glasses: linking the chemical composition to structural, physical and fracture properties

Rountree¹

2017

J. Phys. D: Appl. Phys.

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Recent IntroductionOxide glasses are among the oldest industrial materials known to man, and they are widely used due to their advantageous properties: transparency, low thermal expansion, high melting point temperature, relative inertness, etc. Yet, oxide glasses are not without significant shortcomings. In par ticular, they remain inherently brittle, despite significant scientific ingenuity to overcome this drawback. Moreover, they undergo abrupt catastrophic failure. Frequently, post-mortem failure studies reveal material flaws which were propagating via stress corrosion cracking. Understanding and predicting the growth of such flaws under sub-critical crack propagation remains a hurdle for scientists. Furthermore, how the basic glass network (i.e. the interconnect of the glass structure) dictates the physical, mechanical and stress corrosion cracking AbstractThis topical review is dedicated to understanding stress corrosion cracking in oxide glasses and specifically the SiO 2 B 2 O 3 Na 2 O (SBN) ternary glass systems. Many review papers already exist on the topic of stress corrosion cracking in complex oxide glasses or overly simplified glasses (pure silica). These papers look at how systematically controlling environmental factors (pH, temperature...) alter stress corrosion cracking, while maintaining the same type of glass sample. Many questions still exist, including: What sets the environmental limit? What sets the velocity versus stress intensity factor in the slow stress corrosion regime (Region I)? Can researchers optimize these two effects to enhance a glass' resistance to failure? To help answer these questions, this review takes a different approach. It looks at how systemically controlling the glass' chemical composition alters the structure and physical properties. These changes are then compared and contrasted to the fracture toughness and the stress corrosion cracking properties. By taking this holistic approach, researchers can begin to understand the controlling factors in stress corrosion cracking and how to optimize glasses via the initial chemical composition.

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“…From the detailed analyses of the B-O and O-B coordination number distributions we have established that both 3-and 4-fold coordinated boron atoms (denoted as [3] B and [4] B) are present. We suppose that the boron atoms partly form a mixed continuous network with Si-O network, where several different mixed [4] B-O-Si and [3] B-O-Si linkages are present in agreement with the findings of NMR [4,5] and Raman spectroscopy [6]. According to the cosmochemical arguments and the seismological data, the Earth's core must contain some light elements.…”

Section: Ms23 O2mentioning

confidence: 99%

Short- and intermediate range order in borosilicate waste glasses

Sváb¹,

Fábián²,

Veress³

et al. 2007

Acta Cryst Sect A

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One of the key issues in predicting the suitability of cementitious waste forms for safe disposal of radioactive wastes is the long-term stability of the strength dominating cement hydrate, the calcium silicate hydrate gel (C-S-H). Its microstructure not only determines physical characteristics like mechanical strength and microporosity, but also heavily influences chemical parameters, especially the pH, which is essential in preventing corrosion of reinforced materials [1]. The C-S-H structure and the structural changes caused e.g. by carbonation in air are still not well known. The principal reason is the poor crystallinity, the difficulties in preparing homogeneous samples and the poor stability during analysis. Raman spectra of a series of mechanochemically prepared C-S-H samples with C/S ratios from 0.2 to 1.5 reveal changes in structure with changes in the C/S ratio. Samples with C/S ratios from 0.66 to 1 are dominated by Q 2 (chain elements). At C/S > 1 dimers are the main building unit [2]. Exposure to air results in very fast surface carbonation. Amorphous calcium carbonate is formed within minutes. Type and extent of carbonation is very sensitive to the C/S ratio of the primary phase. In experiments, which lasted up to 6 month, most spectra showed broad bands of amorphous silica. However, C-S-H with a C/S ratio of 0.66 and 0.75 showed only minor carbonation. Amorphous carbonate crystallizes over time to give primarily vaterite at C/S > 0.67 and aragonite at C/S<= 0.5. Calcite was not observed as a principal carbonation product [3]. With respect to carbonation the results suggest the addition of silica fume to cementitious waste forms.[1] Galle, C.; Peycelon, H.; Le Bescop, P.; Bejaoui, S.; L´Hostis, V.; Bary, B.; Bouniol, P.; Richet, C., J.Phys. IV France, 2006, 136, 25. [2] Garbev, K.; Stemmermann, P.; Black, L.; Breen, C.; Yarwood, J.; Gasharova, B., J. Am. Ceram. Soc., 2007, 90, 900. [3] Black, L.; Breen, C.; Yarwood, J.; Garbev, K.; Stemmermann, P.; Gasharova, B., J. Am. Ceram. Soc., 2007, 90, 908. MS23 O2Wasteform design for nuclear waste immobilisation: one size does not fit all Neil Hyatt, Immobilisation Science University, Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD.Nuclear power has enjoyed a resurgence of interest in recent years and was described as "back on the agenda with a vengeance", in a recent speech by Prime Minister Tony Blair. This resurgence is motivated by the need to ensure security of energy supply and to reduce dependence on carbon fuels in order to combat global warming. Deployment of nuclear power on a scale to address these issues in the UK, and elsewhere, raises legitimate concerns regarding the production of nuclear wastes proliferation of fissile materials. Over shadowing this debate is the waste legacy of over 50 years of civil (and defence) related nuclear activities, the clean up of which is estimated to be in excess of £70bn in the UK alone. The eventual fate of all nuclear waste is disposal in an appropr...

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Density–structure relations in mixed-alkali borosilicate glasses by 29Si and 11B MAS–NMR

Cited by 38 publications

References 8 publications

Network structure of multi-component sodium borosilicate glasses by neutron diffraction

Network structure of multi-component sodium borosilicate glasses by neutron diffraction

Recent progress to understand stress corrosion cracking in sodium borosilicate glasses: linking the chemical composition to structural, physical and fracture properties

Short- and intermediate range order in borosilicate waste glasses

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