TEM characterisation of helium platelets in implanted uranium dioxide

Adrien Michel (1, 2) , Gaëlle Carlot (3, 2) , Claire Onofri (4, 2) , Catherine Sabathier (2) , Martiane Cabié (5) , Myriam Dumont (6)

1 MSME - Laboratoire de Modélisation et Simulation Multi Echelle
2 CEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire)
3 LM2C - Laboratoire de Modélisation Multi-échelles des Combustibles
4 CEMES - Centre d'élaboration de matériaux et d'études structurales
5 AMU SPEC - Spectropôle - Aix Marseille Université
6 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence

Polycrystalline UO2 discs were implanted with 500 keV helium ions at different temperatures (200, 400 and 600 °C) and fluences (1 and 3 × 1016 at cm−2), and further characterised by transmission electron microscopy (TEM). Examinations performed on the more concentrated sample implanted at 600 °C allowed us to observe platelets for the first time in the UO2 material in planes parallel to . A complete study was undertaken in grains oriented along <1 0 0>, <1 1 0> and <1 1 1> directions to determine {1 1 1} variant equivalence on platelet formation. Their features like density and size have been characterised with an appropriate statistic.

Domains: Nuclear Theory [nucl-th]; Nuclear Experiment [nucl-ex]

Adrien Michel, Gaëlle Carlot, Claire Onofri, Catherine Sabathier, Martiane Cabié, et al.. TEM characterisation of helium platelets in implanted uranium dioxide. Journal of Nuclear Materials, 2020, 528, pp.151832. ⟨10.1016/j.jnucmat.2019.151832⟩. ⟨cea-02535031⟩