A Preliminary Investigation of the <scp>ISG</scp> Glass Vapor Hydration

Abdelouas, Abdesselam; Mendili, Yassine El; Chaou, Abdelouahed Ait; Karakurt, Gökhan; Hartnack, C.; Bardeau, Jean‐François; Saito, Takumi; Matsuzaki, Hiroyuki

doi:10.1111/ijag.12055

Cited by 34 publications

(34 citation statements)

References 41 publications

(85 reference statements)

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“…Formation of C-S-H phases during the alteration of ISG has also been reported by Gin et al 14 and Abdelouas et al, 31 however these authors observed the precipitation of C-S-H when ISG was altered in a KOH solution at pH 11.5 14 or the formation of tobermorite (a crystalline C-S-H phase) when ISG was altered under different relative humidities. 31 In both of these cases the Si and Ca consumed in forming C-S-H must originate from the glass. Despite this, it is notable that the Ca/Si ratios reported by Gin et al…”

Section: Discussionsupporting

confidence: 62%

Corrosion of the International Simple Glass under acidic to hyperalkaline conditions

et al. 2018

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Assessment of glass dissolution kinetics, under disposal relevant temperature and pH environments, is required to credibly estimate radionuclide release rates from vitrified radioactive waste. Leaching of the International Simple Glass (ISG) under acidic to hyperalkaline conditions was examined. Forward rate measurements have been obtained using the dynamic leaching SPFT protocol and rate parameters for B, Na and Si in the basic regime; errors in rates predicted using these parameters at high pH and temperature are significant because the fitting uses logarithmic data. Longer term behaviour under hyperalkaline conditions, representative of some disposal environments, was investigated using the PCT and MCC-1 static leaching protocols with Ca(OH)2 solutions for up to 120 days (PCT) and 720 days (MCC-1). In hyperalkaline conditions dissolution was incongruent for all elements and the presence of alternating zirconia-rich and zirconia-poor alteration layers was observed on all leached monoliths, indicating the occurrence of a self-organisation phenomenon during leaching.

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Section: Discussionsupporting

confidence: 62%

Corrosion of the International Simple Glass under acidic to hyperalkaline conditions

et al. 2018

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“…1 International Simple Glass (ISG) is a simplified model composition for a collaborative study of dissolution/corrosion mechanism of highlevel waste (HLW) glasses. [2][3][4] ISG has been intensively researched recently with studies focusing on its dissolution behavior under different conditions, 3,[5][6][7][8][9][10][11][12] its surface quality, 13 radiation effect, [14][15][16][17][18] waste loading, 19 mechanical property, 20,21 and especially on the properties of its alteration layers using diverse techniques such as electron microprobe analysis, 22 Doppler broadening positron annihilation spectroscopy, 23 and atom probe tomography. 24 However, due to the lack of long-range periodicity, the structural study of glass materials exhibits many challenges.…”

Section: Introductionmentioning

confidence: 99%

Structural role of ZrO2 and its impact on properties of boroaluminosilicate nuclear waste glasses

Deng

Kerisit

et al. 2018

npj Mater Degrad

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Addition of zirconia (ZrO 2 ) to nuclear waste glasses, even in small amount, significantly affects physical properties such as chemical durability, density, viscosity, and glass transition temperature. Hence ZrO 2 plays an important role in the development of nuclear waste glass compositions. It was found recently that addition of zirconia decreases the initial dissolution rate but increases longterm dissolution by changing the protective properties such as porosity of alteration layers. In this study, the International Simple Glass (ISG) with different amounts of ZrO 2 /SiO 2 substitution was simulated using classical molecular dynamics (MD) simulations and recently developed composition-dependent potential sets. Local structural descriptors such as bond distances, bond angle distributions, and coordination numbers were systematically studied and compared with experimental values. Zr K-edge extended X-ray absorption fine structure spectra were also calculated and compared with experiment to resolve the local coordination environment around Zr. Medium-range structural information (e.g., Q n distribution, network connectivity, and ring-size distribution) showed that ZrO 2 /SiO 2 substitution increases the overall network connectivity and the amount of smaller sized rings, which will decrease the initial dissolution rate by strengthening the glass network and limiting water diffusivity. Finally, diffusion and dynamic properties of the ions were studied and discussed to develop a better understanding of the chemical durability of these glasses.

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“…3 ISG has been intensively researched by the international community using multiple methods for various purposes as seen in these cited examples and in the web collection on ISG associated with npj Materials Degradation (https://www.nature.com/collections/ wwcfskftrj). 14,[29][30][31][32][33][34][35][36][37] Table 1 shows the buffered reaction solution pH (90°C) before and after the alteration experiments. The alteration experiment samples are identified by a three character code (XXX), where the first character represents the target pH of the reactant solution (3,5,7,9,11), the second character refers to the glass used (I for ISG), and the third denotes the experiment duration in days (7).…”

Section: Introductionmentioning

confidence: 99%

Comparative structural investigations of nuclear waste glass alteration layers and sol-gel synthesized aerogels

et al. 2020

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While various glass alteration layer formation mechanisms have been debated in recent years, the glass alteration community generally agrees that more information on physical properties of the alteration layers is needed to further the understanding of their impacts on overall glass alteration. In this work, pore volumes and solid structures of glass (International Simple Glass, ISG) alteration layers formed in solutions of various pH conditions in initially dilute conditions at 90°C are evaluated with positron annihilation spectroscopy, small-angle X-ray scattering, and scanning transmission electron microscopy. Pore volumes of alteration layers formed at pH 9 were found to be at their lowest near the surfaces of the alteration layers. Solid structures of alteration layers are compared with those of synthetic aerogels of comparable compositions produced under various pH conditions. Alteration layers formed at pH 11 on ISG were shown to contain large structures (>10 nm) similar to synthetic aerogels created under neutral and basic conditions whereas alteration layers formed at pH 9 did not. Available dissolved silica species defined by silica solubility were proposed to have the greatest impact on alteration layer structure.npj Materials Degradation (2020) 4:5 ; https://doi.

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A Preliminary Investigation of the ISG Glass Vapor Hydration

Cited by 34 publications

References 41 publications

Corrosion of the International Simple Glass under acidic to hyperalkaline conditions

Corrosion of the International Simple Glass under acidic to hyperalkaline conditions

Structural role of ZrO2 and its impact on properties of boroaluminosilicate nuclear waste glasses

Comparative structural investigations of nuclear waste glass alteration layers and sol-gel synthesized aerogels

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