XANES analysis of a Cm-doped borosilicate glass under $$\alpha $$ α -self-irradiation effects

Bouty, O.; Ramond, L.; Solari, Pier-Lorenzo; Cammelli, Sebastiano

doi:10.1007/s10853-016-0058-6

Cited by 10 publications

(13 citation statements)

References 31 publications

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“…5). This change could be correlated to the evolution of Zr site with irradiation as observed by Bouty et al, 7 with an increase of the seven fold coordinated site with respect to the octahedral site. A specific configuration of SiO 4 tetrahedral around the Zr octahedral could thus be the origin of the Q a band and its decrease with irradiation.…”

Section: Discussionsupporting

confidence: 57%

“…11 B, 29 Si, 27 Al, and 23 Na by NMR spectroscopy 6 and Zr, Pu, and Cm by Xanes spectroscopy. 7 Therefore, both the short range and medium range orders of the glass are affected by alpha decay selfirradiation. The main short range order changes are a decrease by around 7% of the mean boron coordination number (higher boron content in trigonal configuration in the irradiated glass and lower boron content in tetrahedral configuration, Fig.…”

Section: Discussionmentioning

confidence: 99%

“…2 This glass is also a simplified version, i.e. composed of six oxides, of the French R7T7 nuclear glass and was already partially studied with respect to radiation effects [3][4][5][6][7][8] and leaching behavior. [9][10][11][12][13][14][15][16][17][18] The characterization of the irradiated glassy state of ISG glass is of significant importance for the scientific community working in this international initiative about nuclear glass long-term behavior by offering a description of the glassy state after several thousand years of storage time, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Radiations effects in ISG glass: from structural changes to long-term aqueous behavior

et al. 2018

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The aim of the studies about the stability of nuclear glasses is to predict as accurately as possible their behavior over geological timescale. It requires the development of experimental methods to accelerate their irradiation and leaching ageing. This study focuses on the International Simple Glass behavior under irradiation by evaluating its structural and macroscopic property evolutions, and also its long-term chemical durability. Two irradiation ageing scenarios are considered: an alpha self-irradiation of a 244 Cm-doped-ISG glass and an external irradiation with few MeV gold ions of non-radioactive ISG glass coupons. The results obtained from the Raman spectroscopy, density, and hardness measurements led to the conclusion that ballistic effects from the recoil nuclei are responsible of the changes with dose observed under alpha self-irradiation and that the ISG glass is a good surrogate of the French nuclear SON68 complex glass under such irradiation conditions. The assessment of the structural evolution with dose of this glass reinforces the mechanistic concepts about the glass response under alpha self-irradiation damage, where the glass response to a recoil nucleus event is the result of a very fast quenching of the damaged zone in the displacement cascade. Furthermore, the irradiation damage induced by gold ions does not fully mimic the 244 Cm-doped glass evolution with nuclear dose, since the results of this simulation method overestimates the amplitude of the irradiation damage in the glass because the effects of the alpha particle are not included. Finally, this study demonstrates that the ISG glass water alteration at high-reaction progress is impacted by the glass damage, which indicates that the long-term glass chemical durability will depend on the glass structure when water arrives in contact.

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Section: Discussionsupporting

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Radiations effects in ISG glass: from structural changes to long-term aqueous behavior

et al. 2018

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“…Bouty et al 26,27 used the Empirical Potential Structure Refinement (EPSR) method, a reverse Monte Carlo technique, to develop an atomistic simulation of ISG from experimental wide-angle X-ray scattering (WAXS), neutron diffraction, 11 B NMR, and Zr K-edge Xray absorption near edge structure 28 and extended X-ray absorption fine structure (EXAFS) data collected on ISG that was fabricated in their laboratory. The EPSR method uses a combined Lennard-Jones and Coulomb potential; once a stable glass structure is achieved, a small perturbation term (an "empirical potential") is introduced which evolves during the simulation to better fit the experimental structure factor data.…”

Section: Bulk Densitymentioning

confidence: 99%

Physical and optical properties of the International Simple Glass

et al. 2019

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Radioactive waste immobilization is a means to limit the release of radionuclides from various waste streams into the environment over a timescale of hundreds to many thousands of years. Incorporation of radionuclide-containing wastes into borosilicate glass during vitrification is one potential route to accomplish such immobilization. To facilitate comparisons and assessments of reproducibility across experiments and laboratories, a six-component borosilicate glass (Si, B, Na, Al, Ca, Zr) known as the International Simple Glass (ISG) was developed by international consensus as a compromise between simplicity and similarity to waste glasses. Focusing on a single glass composition with a multi-pronged approach utilizing state-of-the-art, multi-scale experimental and theoretical tools provides a common database that can be used to assess relative importance of mechanisms and models. Here we present physical property data (both published and previously unpublished) on a single batch of ISG, which was cast into individual ingots that were distributed to the collaborators. Properties from the atomic scale to the macroscale, including composition and elemental impurities, phase purity, density, thermal properties, mechanical properties, optical and vibrational properties, and the results of molecular dynamics simulations are presented. In addition, information on the surface composition and morphology after polishing is included. Although the existing literature on the alteration of ISG is not extensively reviewed here, the results of well-controlled static alteration experiments are presented here as a point of reference for other performance investigations.

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“…The ISG-C glass used in this study was initially melted in 2007 at the Atalante hot-cell facility (Bouty et al, 2016). A glass fragment was broken into small pieces of approximately 30-35 mg each.…”

Section: Radioactive Sample Preparationmentioning

confidence: 99%

Two-dimensional Wide-Angle X-ray Scattering on a Cm-doped borosilicate glass in a beryllium container

Bouty

Ramond

Dardenne

et al. 2021

J Synchrotron Radiat

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The two-dimensional wide-angle X-ray diffraction technique was applied to a Cm-doped borosilicate glass in a beryllium container. The experiment involved a high-energy X-ray beam and an image plate. It is shown that it is possible to extract the structure factor of the radioactive glass successfully from diffraction patterns and compare it with that of the pristine one. Striking differences appear under the first diffraction peak, revealing new sub-structures for the radioactive glass. It is suggested that they could be related to structural changes in the medium-range order, in particular the size distribution of rings or chains under the influence of mixed interactions between the glass network, α-particles and recoil nuclei.

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XANES analysis of a Cm-doped borosilicate glass under $$\alpha $$ α -self-irradiation effects

Cited by 10 publications

References 31 publications

Radiations effects in ISG glass: from structural changes to long-term aqueous behavior

Radiations effects in ISG glass: from structural changes to long-term aqueous behavior

Physical and optical properties of the International Simple Glass

Two-dimensional Wide-Angle X-ray Scattering on a Cm-doped borosilicate glass in a beryllium container

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