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Article Dans Une Revue Journal of Nuclear Materials Année : 2016

X-ray diffraction study of the Y2Ti2O7 pyrochlore disordering sequence under irradiation

Soulié Aurélien
  • Fonction : Auteur
Menut Denis
  • Fonction : Auteur
Crocombette Jean-Paul
Chartier Alain
Sellami Neila
  • Fonction : Auteur
Monnet Isabelle
Béchade Jean-Luc

Résumé

The disordering sequence of Y2Ti2O7 pyrochlore, a nano-oxide phase that strengthens ODS steels under irradiation is studied in the experimental and modeling framework. XRD analysis has been performed considering both swift heavy ion and low energy/low mass ion irradiations. The simulation within molecular dynamics of Frenkel pair accumulation proves able to reproduce the variation of the amorphization fluence with temperature. XRD patterns calculated from the simulations reproduce well the patterns observed experimentally in the literature. Both experiments and calculations point to a first transition from pyrochlore to fluorite before an eventual amorphization. For swift heavy ion irradiations with 93 MeV Xe ions, tracks of direct impact amorphization are visible by HRTEM. Advanced refinement shows that one third of the pyrochlore impacted by an ion transforms into fluorite, while two third are directly amorphized.
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Dates et versions

in2p3-01389509 , version 1 (28-10-2016)

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Soulié Aurélien, Menut Denis, Crocombette Jean-Paul, Chartier Alain, Sellami Neila, et al.. X-ray diffraction study of the Y2Ti2O7 pyrochlore disordering sequence under irradiation. Journal of Nuclear Materials, 2016, 480, pp.314-322. ⟨10.1016/j.jnucmat.2016.08.005⟩. ⟨in2p3-01389509⟩
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