Study of irradiation damage in borosilicate glass induced by He ions and electrons

Yang, Kunjie; Wang, T.S.; Zhang, G.F.; Peng, Haibo; Chen, L.; Zhang, L.M.; Li, C.X.; Tian, Feng; Wang, Yuan

doi:10.1016/j.nimb.2012.12.113

Cited by 56 publications

(41 citation statements)

References 21 publications

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“…While many structural modifications have been observed in homogenous systems, not all of them are negative. Beta irradiation can lead to an increase in polymerization of the borosilicate network [33,68] and can also increase the fracture toughness of the bulk [34] with a dependency on the glass composition.…”

Section: Radiation Effectsmentioning

confidence: 99%

“…Accumulated defects can also lead to glass-in-glass phase separation [26,32]. Alteration to the internal structure and connectivity of amorphous phases is of significance, as modification can result in changes to macroscopic properties such as density and hardness [33,34]. Molybdate formation and radiation effects on homogeneous borosilicates have been independently examined, but very few studies correlate the effects of radiation on phase separation and even fewer investigate the calcium borosilicate system.…”

Section: Introductionmentioning

confidence: 99%

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Impacts of composition and beta irradiation on phase separation in multiphase amorphous calcium borosilicates

Patel

Boizot

Facq

et al. 2017

Journal of Non-Crystalline Solids

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A B S T R A C TBorosilicate glasses for nuclear waste applications are limited in waste loading by the precipitation of watersoluble molybdates. In order to increase storage efficiency, new compositions are sought out that trap molybdenum in a water-durable CaMoO 4 crystalline phase. Factors affecting CaMoO 4 combination and glass-inglass phase separation in calcium borosilicate systems as a function of changing [MoO 3 ] and [B 2 O 3 ] are examined in this study in order to understand how competition for charge balancers affects phase separation. It further examines the influence of radiation damage on structural modifications using 0.77 to 1.34 GGy of 2.5 MeV electron radiation that replicates inelastic collisions predicted to occur over long-term storage. The resulting microstructure of separated phases and the defect structure were analyzed using electron microscopy, XRD, Raman and EPR spectroscopy prior to and post irradiation. Synthesized calcium borosilicates are observed to form an unusual heterogeneous microstructure composed of three embedded amorphous phases with a solubility limit~2.5 mol% MoO 3. Increasing [B 2 O 3 ] increased the areas of immiscibility and order of (MoO 4 ) 2 − anions, while increasing [MoO 3 ] increased both the phase separation and crystallization temperature resulting in phases closer to metastable equilibrium, and initiated clustered crystallization for [MoO 3 ] > 2.5 mol%. β-irradiation was found to have favorable properties in amorphous systems by creating structural disorder and defect assisted ion migration that thus prevented crystallization. It also increased reticulation in the borosilicate network through 6-membered boroxyl ring and Si ring cleavage to form smaller rings and isolated units. This occurred alongside an increased reduction of Mo 6 + with dose that can be correlated to molybdenum solubility.In compositions with existing CaMoO 4 crystallites, radiation caused a scattering effect, though the crystal content remained unchanged. Therefore β-irradiation can preferentially prevent crystallization in calcium borosilicates for [MoO 3 ] < 2.5 mol%, but has a smaller impact on systems with existing CaMoO 4 crystallites.

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Section: Radiation Effectsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impacts of composition and beta irradiation on phase separation in multiphase amorphous calcium borosilicates

Patel

Boizot

Facq

et al. 2017

Journal of Non-Crystalline Solids

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“…As the R7T7 nuclear industrial glass is still too complex to be scrutinized in a microscopic point of view, a more simplified glass, but still representative, has been defined on a six-oxide basis (called International Simplified Glass or ISG, see Table 1 for composition) for scientific purposes. Irradiation damage coming from a-decay (involving He 2þ particles and recoil nuclei) processes, can be investigated by two main techniques: first by doping the initial glass with curium actinide (which decays generally to Pu by emitting an a particle, and for which 244 Cm half-life reaches 18 years), or by external irradiations with low or high mass particles like He 2þ , Kr þ ... [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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

Bouty

Ramond²,

Solari

et al. 2016

J Mater Sci

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Industrial borosilicate glasses containing fission products and minor actinides can be subjected to structural damage caused mainly by a-self-irradiation effects. In this field of glasses under extreme conditions, we present an X-ray Absorption Near-Edge Structure investigation of two six-oxide borosilicate curium-doped glasses (based on the International Simplified Glass (ISG) composition). The first sample is an 8-year ISG damaged glass, which has already accumulated an a-decay dose greater than 6.10 18 a g À1 , a value corresponding to a damaged but stabilized structural state. The second sample results from annealing of the latter ISG damaged glass. Three species, Cm, Pu and Zr were probed at L 3 -edge, L 3 -edge and K-edge, respectively. From the experimental results, Cm and Pu species appear respectively in ?3 and ?4 oxidation states in both glasses. No Cm local environment changes are observed. In contrast, a small variation in Pu local environment appears between the damaged and annealed glasses, reflecting a possible coordination variation or Pu-Zr substitution. A more drastic effect appears for Zr local environment, where a sevenfold coordinated site grows over time under a-self-irradiation effects, at the expense of the initial major sixfold site of symmetry. Moreover, annealing the damaged glass does not permit to retrieve a similar structural state to the one of a just melted curium-doped ISG.

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“…The irradiation induced shrinking of amorphous SiO 2 has been correlated more recently to an increase of the small silicon ring concentration and the associated decrease of the Si-O-Si bond angle [30,31]. In contrast, further studies using a variety of radiation sources [12,32,33,14,13,34] show less marked effects on vitreous silica when irradiated with electrons and photons than those found for vitreous borosilicate. For this kind of glass, the macroscopic evolution under irradiation has also been correlated to structural changes [35].…”

Section: Considerations Regarding Glass Density Variationsmentioning

confidence: 99%

Why neutron guides may end up breaking down? Some results on the macroscopic behaviour of alkali-borosilicate glass support plates under neutron irradiation

Boffy

Kreuz

Beaucour

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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a b s t r a c tIn this paper we report on a first part of a study on the mechanisms leading to brittle fracture in neutron guides made of glass as structural element. Such devices are widely used to deliver thermal and cold neutron beams to experimental lines in most large neutron research facilities. We present results on macroscopic properties of samples of guide glass substrates which are subjected to neutron irradiation at relatively large fluences. The results show a striking dependence of some of the macroscopic properties such as density, shape or surface curvature upon the specific chemical composition of a given glass. The relevance of the present findings for the installation of either replacement guides at the existing facilities or for the deployment of instruments for ongoing projects such as the European Spallation Source is briefly discussed.

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Study of irradiation damage in borosilicate glass induced by He ions and electrons

Cited by 56 publications

References 21 publications

Impacts of composition and beta irradiation on phase separation in multiphase amorphous calcium borosilicates

Impacts of composition and beta irradiation on phase separation in multiphase amorphous calcium borosilicates

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

Why neutron guides may end up breaking down? Some results on the macroscopic behaviour of alkali-borosilicate glass support plates under neutron irradiation

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