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Article Dans Une Revue Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Année : 2018

In situ characterization of irradiation-induced microstructural evolution in urania single crystals at 773 K

Résumé

Implantations with low-energy ions (Xe, La) on UO2 single crystals at 773 K were performed to investigate the role played by both the radiation damage and the incorporation of foreign elements on the matrix destabilisation. The radiation damage was monitored by both in situ RBS-C and in situ TEM during ion irradiation experiments performed at 773 K. RBS-C data shows a similar regular increase of the radiation-induced disorder in crystals for both Xe and La ions followed by a saturation plateau at about 3–4 dpa. An unexpected difference of the value of the saturation plateaus is observed, with a higher value recorded for Xe-irradiated crystals. In situ TEM images show the apparition and evolution of several defects as a function of the ion dose up to 40 dpa, irrespective of the nature of the bombarding ion: ‘black dots’ defects, dislocation loops and lines, and finally a dislocation network at high dpa. Nanometre-sized gas bubbles were observed at 773 K for the Xe-implanted crystal for doses larger than 3 dpa. Neither precipitate nor cavity were observed on La-implanted crystals. The difference in the saturation plateau as seen by RBS-C can be ascribed to the formation of the Xe aggregates that lead to an increase of the dechannelling yield.
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Dates et versions

hal-01990271 , version 1 (23-01-2019)

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Yara Haddad, Lucie Delauche, Aurélie Gentils, Frederico Garrido. In situ characterization of irradiation-induced microstructural evolution in urania single crystals at 773 K. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2018, 435, pp.25-30. ⟨10.1016/j.nimb.2017.12.019⟩. ⟨hal-01990271⟩
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