Alpha Decays Impact on Nuclear Glass Structure

Peuget, S.; Mendoza, Clément; Maugeri, E. A.; Delaye, Jean‐Marc; Caraballo, R.; Charpentier, Thibault; Tribet, M.; Bouty, O.; Jégou, Christophe

doi:10.1016/j.mspro.2014.10.033

Cited by 15 publications

(11 citation statements)

References 29 publications

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“…Swelling of approximately 4-9% was observed in SBN glasses and 4-5% in SBNA glasses. Similar swelling in borosilicate glasses with the amplitude depending upon composition and irradiation conditions, has been observed in studies with doped glasses (0.5-0.6% [11,13]), external irradiation (1.3-2.4% [52,53]), and simulations (3-7% [28,30,54]).…”

Section: Evolution Of Pressure With Deposited Energysupporting

confidence: 78%

Molecular dynamics simulation of ballistic effects in simplified nuclear waste glasses

Jan

Delaye

Gin

et al. 2019

Journal of Non-Crystalline Solids

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Ballistic effects in simple sodium borosilicate () and sodium alumino-borosilicate glasses () were investigated using molecular dynamics simulations. Specifically, the glasses were irradiated with heavy projectiles that caused atomic displacements by elastic collisions (displacement cascades) and progressively damaged the bulk glass. The accumulated pressure and internal energy inside the glass were found to saturate with deposited energy. Furthermore, structural analysis of the irradiated glasses revealed several important ballistic effects including a decrease in glass density, depolymerization of the borosilicate network, and increase in chemical mixing, short range and intermediate disorder. The magnitude of radiation damage was found to depend on the glass composition and, in general, alumino-borosilicate glasses were found to be slightly less damaged, after irradiation, as compared to borosilicate glasses.

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Section: Evolution Of Pressure With Deposited Energysupporting

confidence: 78%

Molecular dynamics simulation of ballistic effects in simplified nuclear waste glasses

Jan

Delaye

Gin

et al. 2019

Journal of Non-Crystalline Solids

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“…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%

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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“…14a). According to literature [77,79,80] this shift could be attributed to a reduction in the Si-O-Si bond angle between silica tetrahedra and could indicate an increase of the depolymerization of the silicate network (i.e. increase of the amount of non-bridging oxygen atoms (NBOs)) after irradiation as shown by molecular dynamics [81].…”

Section: Raman Spectroscopy Measurementsmentioning

confidence: 91%

“…Thus, in accordance with several structural results reported in literature on irradiated borosilicate glasses [77,80,84], a fraction of the BO4 units present in the RG glass before irradiation may have transformed into BO3 units after irradiation releasing charge compensators such as Na + cations (initially used for the charge compensation of the negatively charged BO4 units) and non-bridging oxygens (NBO) in glass structure. For instance, 11 B MAS NMR and molecular dynamics studies have reported the partial transformation of BO4 into BO3 units under heavy ions irradiation or  decay self-irradiation and proposed that the structural evolution under irradiation(disorganization + reconstruction of glass structure) could be interpreted as freezing a glass structure with higher fictive temperature than pristine glass[77,80,81,85].…”

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confidence: 99%

External irradiation with heavy ions of neodymium silicate apatite ceramics and glass-ceramics

Chouard

Caurant

Majérus

et al. 2019

Journal of Nuclear Materials

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This work aims at comparing the damage induced in the Nd silicate apatite ceramic (Ca2Nd8(SiO4)6O2) by medium energy (ME) and swift heavy ion (SHI) irradiations to evaluate the effects of nuclear collisions and intense electronic excitations for ME ions and SHI ions respectively. The macroscopic induced changes were studied as a function of the fluence by swelling and hardness measurements, whereas structural modifications were followed by X-ray diffraction, Raman spectroscopy and grazing incidence EXAFS (Nd L3-edge). At ME (1.9-6.75 MeV Au ions), radiation-induced amorphization occurred above 6.22x10 13 Au/cm 2 associated with a volume expansion of about 8% and a drop of 37% in hardness. At SHI (90 MeV Xe ions or 35 MeV Ar ions), similar macroscopic and structural changes were observed. The electronic stopping power threshold of Nd silicate apatite for amorphization was assessed at about Se = 5 keV/nm. As apatite crystals containing actinides could be present in rare-earths rich nuclear glasses, SHI irradiation with Xe (995 MeV) ions was also used to damage the Nd silicate apatite crystals dispersed in a soda-lime aluminoborosilicate simplified nuclear glass over a depth of about 60 µm, to evaluate the possible formation of cracks in the residual glass due to crystals swelling. In spite of apatite crystals amorphization under SHI irradiation in the glass-ceramics, no cracking was observed in the glassy phase even close to the biggest crystals which could be explained by strain relaxation in the glass due to plastic deformation (creep) induced by SHI ion beam.

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Alpha Decays Impact on Nuclear Glass Structure

Cited by 15 publications

References 29 publications

Molecular dynamics simulation of ballistic effects in simplified nuclear waste glasses

Molecular dynamics simulation of ballistic effects in simplified nuclear waste glasses

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

External irradiation with heavy ions of neodymium silicate apatite ceramics and glass-ceramics

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