Radiation-Induced Phase Transitions

Ossi, Paolo Maria

doi:10.1007/978-1-4020-5295-8_10

Cited by 3 publications

(2 citation statements)

References 154 publications

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“…Additionally, γ-radiation is known to cause low temperature annealing of metals31. The fact that γ-radiation is capable of inducing structural changes in the bulk material32 and interface with water21—including corrosion333435—lead us to develop this study, which is aimed at understanding whether γ-radiation is capable of triggering the uptake of hydrogen by high-purity metallic copper in aqueous medium. As shown above, one of the radiolysis products of water is hydrogen36.…”

Section: Introductionmentioning

confidence: 99%

Gamma radiation induces hydrogen absorption by copper in water

Lousada

Soroka

Yagodzinskyy

et al. 2016

Sci Rep

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One of the most intricate issues of nuclear power is the long-term safety of repositories for radioactive waste. These repositories can have an impact on future generations for a period of time orders of magnitude longer than any known civilization. Several countries have considered copper as an outer corrosion barrier for canisters containing spent nuclear fuel. Among the many processes that must be considered in the safety assessments, radiation induced processes constitute a key-component. Here we show that copper metal immersed in water uptakes considerable amounts of hydrogen when exposed to γ-radiation. Additionally we show that the amount of hydrogen absorbed by copper depends on the total dose of radiation. At a dose of 69 kGy the uptake of hydrogen by metallic copper is 7 orders of magnitude higher than when the absorption is driven by H2(g) at a pressure of 1 atm in a non-irradiated dry system. Moreover, irradiation of copper in water causes corrosion of the metal and the formation of a variety of surface cavities, nanoparticle deposits, and islands of needle-shaped crystals. Hence, radiation enhanced uptake of hydrogen by spent nuclear fuel encapsulating materials should be taken into account in the safety assessments of nuclear waste repositories.

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Section: Introductionmentioning

confidence: 99%

Gamma radiation induces hydrogen absorption by copper in water

Lousada

Soroka

Yagodzinskyy

et al. 2016

Sci Rep

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“…Additionally, the results of irradiation experiments using electrons and ion beams on quasicrystals have demonstrated that there is an irradiation-induced crystallinequasicrystalline-amorphous phase transformation. [10][11][12][13] However, it is nearly impossible to experimentally study this irradiation process on the atomic scale as it usually happens over several ns. Besides, most of the experimental works on irradiation effects in quasicrystals were performed at higher energies (from several hundreds of keV to GeV).…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulation of radiation damage in CaCd6 quasicrystal cubic approximant up to 10 keV

Chen

Avchachov

Nordlund

et al. 2013

The Journal of Chemical Physics

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Due to the peculiar nature of the atomic order in quasicrystals, examining phase transitions in this class of materials is of particular interest. Energetic particle irradiation can provide a way to modify the structure locally in a quasicrystal. To examine irradiation-induced phase transitions in quasicrystals on the atomic scale, we have carried out molecular dynamics simulations of collision cascades in CaCd 6 quasicrystal cubic approximant with energies up to 10 keV at 0 and 300 K. The results show that the threshold energies depend surprisingly strongly on the local coordination environments. The energy dependence of stable defect formation exhibits a power-law dependence on cascade energy, and surviving defects are dominated by Cd interstitials and vacancies. Only a modest effect of temperature is observed on defect survival, while irradiation temperature increases lead to a slight increase in the average size of both vacancy clusters and interstitial clusters.

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Induction of Molecular Organization of Oligomers by Low‐Energy Electrons

Lau

Weng

et al. 2010

Macromol. Rapid Commun.

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We reveal that a beam of low-energy electrons (18 eV) can directly trigger long-range molecular ordering of an amorphous, semi-flexible oligomer in a few minutes without the prerequisite of pre-orientation. A strong endothermic transition was detected with a micro-thermal analyzer on the areas that had been exposed to the electron irradiation while the areas that were shielded from the irradiation by a protective mask remained amorphous as usual. This result suggests that long-range molecular ordering only develops in the area of the oligomer film under electron irradiation. This is the first-time effort to use electron irradiation to control the long-range ordering of an amorphous organic thin film above the glass transition temperature.

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Radiation-Induced Phase Transitions

Cited by 3 publications

References 154 publications

Gamma radiation induces hydrogen absorption by copper in water

Gamma radiation induces hydrogen absorption by copper in water

Molecular dynamics simulation of radiation damage in CaCd6 quasicrystal cubic approximant up to 10 keV

Induction of Molecular Organization of Oligomers by Low‐Energy Electrons

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