The Influence of Glass Composition on Iodine Solubility

Cicconi, Maria Rita; Pili, Éric; Grousset, Lucie; Neuville, Daniel R.

doi:10.1557/adv.2018.665

Cited by 14 publications

(25 citation statements)

References 15 publications

(13 reference statements)

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“…Both glass transition temperature (Tg) and volumetric mass density (density for short) increase smoothly until a SiO 2 /(B 2 O 3 + SiO 2 ) molar ratio = 0.75, and then sharply decrease. The substitution of Si for B induces differences in Tg and density up to 20–22%, in agreement with previous data in the NBS system 14,18 . The density of the I-bearing glasses is reported for comparison (Fig.…”

Section: Resultssupporting

confidence: 92%

“…Hence, iodine does not play directly the role of network-modifier in the glass but contributes to change the structure by affecting the structural role of the network-modifier/charge balancer elements ( i.e . sodium or potassium) 14 .…”

Section: Discussionmentioning

confidence: 99%

“…Batch of 300 mg of the powdered mixtures were inserted in platinum capsules and welded to avoid iodine leakage during experiments. Syntheses were carried out in a hot isostatic press (HIP) at Institut de Physique du Globe de Paris, as described in 14 . The HIP is a medium-pressure (up to 2000 bars) high-temperature (up to 2000 °C) device.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Chemical compositions of all glasses have been analysed with a Cameca SX100 electron microprobe at Sorbonne University (Table 1). Boron nitride and copper iodide were used, respectively, as boron and iodine standards 14 . Ten measurements per sample (at 15 keV and 40 nA) were performed to obtain more representative values of boron and iodine contents; the average compositions are reported in Table 1.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…11–13 . It is quite important to evaluate the radionuclides oxidation state because besides the redox condition of the environment, also the speciation of the elements could influence their (re)distribution and transport in terrestrial materials and in the environment 10,14 . The immobilisation of radioisotope 129 I via vitrification of wasteforms is considered inadequate due to the high volatility and low solubility of iodine in glasses 15 , even if relatively few data are available regarding iodine solubility in melts or in amorphous materials.…”

Section: Introductionmentioning

confidence: 99%

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Iodine solubility and speciation in glasses

Cicconi

Pili

Grousset

et al. 2019

Sci Rep

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The study of iodine in glasses and melts is critical in many areas, from geosciences to materials science to waste management. Glasses in the ternary system Na 2 O-B 2 O 3 -SiO 2 were studied with the goal of identifying a glass matrix able to dissolve large quantities of this element, and to identify the main parameters affecting the solubility of iodine. Two sets of experiments were carried out: the first one with the aim of determining the solubility limit of iodine, and the second one to identify the structural variations occurring within the glass network upon iodine incorporation, and to identify the parameters influencing the most both iodine solubility and speciation. We demonstrated that there is a strong dependence of iodine incorporation on bulk chemistry and glass physical properties. A solubility limit of ~5 mol% I has been assessed for B 2 O 3 -rich glasses and of ~1 mol% for SiO 2 -rich ones, and this composition dependence has been explained by considering the fragility parameter of the glass network. Structural variations in the iodine local environment and in the glass network were characterized by Raman, X-ray Absorption Spectroscopy, and 11 B NMR. Spectroscopy data point out the coexistence of different I species within the glasses, with iodide being the predominant one, surrounded by Na + ions.

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Section: Resultssupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Iodine solubility and speciation in glasses

Cicconi

Pili

Grousset

et al. 2019

Sci Rep

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How to Measure the Oxidation State of Multivalent Elements in Minerals, Glasses, and Melts?

Neuville¹,

Cicconi²,

Losq³

2021

Geophysical Monograph Series

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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.

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Predicting iodine solubility at high pressure in borosilicate nuclear waste glasses using optical basicity: an experimental study

et al. 2022

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Constraining the systematic evolution of iodine solubility in borosilicate glasses is required for the formulation of adequate glass matrices able to immobilize 129 I representing a major troublesome radioisotopes produced by nuclear anthropic activities.We investigated experimentally the change in iodine solubility in a large series of borosilicate glasses synthesized under high-pressure conditions (1.5 GPa) and at 1350°C. The nature of network modifying cation (Na, K, Rb, Ca, Ba and Sr) and the concentration of B2O3 (~<10 mol.% and ~>10 mol.%) have been tested. The XPS measurements showed that iodine speciation in glasses is mostly represented by iodide (I -) for a range of iodine solubility from 0.3 to 3.1 mol.% as determined by SEM EDS and LA-ICP-MS analyses.The iodine solubility is enhanced in glasses with lower B2O3 content and with a higher concentration in network modifying cation. Regardless of the cation nature: alkali or alkalineearth; increasing the cation size appears to induce a decrease in iodine solubility. We used the optical basicity (ΛGlass) and iono-covalent parameter (ICPGlass) to express the large variety of investigated glass compositions; both relating to the electron donor capability of the glass. We show that iodine solubility is positively correlated to ΛGlass and accordingly negatively correlated to ICPGlass. It implies that more iodine will be dissolved in glass compositions having a stronger electron donating capability. Evidence of the relationship between iodine solubility and oxygen network is shown by the iodine solubility positive trend with equilibrium constant of the oxygen speciation. Future work should take these parameters into consideration for modeling iodine solubility in borosilicate glasses providing additional information are collected such as the boron, aluminum and silicon speciation in glasses.

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The Influence of Glass Composition on Iodine Solubility

Cited by 14 publications

References 15 publications

Iodine solubility and speciation in glasses

Iodine solubility and speciation in glasses

How to Measure the Oxidation State of Multivalent Elements in Minerals, Glasses, and Melts?

Predicting iodine solubility at high pressure in borosilicate nuclear waste glasses using optical basicity: an experimental study

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