Évolution microstructurale et transition de phase induites par faisceaux d’ions dans des couches minces épitaxiées d’oxydes de terres rares

Abstract : After doping, the rare earth oxides can acquire interesting optical properties for the optoelectronic devices of the future. These materials can also be used as neutron absorbers in nuclear reactors. Whether during the doping process or in the reactor, these oxides are subjected to irradiation conditions with intense ions. It is important to understand their behavior in this extreme environment. This is the objective of this thesis during which a fundamental study of model materials(epitaxial layers assimilable to single crystals)under ionic irradiation was conducted. The main results show that a phase change, from cubic to monoclinic, occurs under irradiation. This transition, which is not directly driven by the energy deposited by the ions, takes place in several stages linked to distinct microstructural evolutions. Finally, the composition plays a role in the change of structure, gadolinium oxide being more rapidly transformed than Erbium oxide.
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Najah Mejai. Évolution microstructurale et transition de phase induites par faisceaux d’ions dans des couches minces épitaxiées d’oxydes de terres rares. Physique des accélérateurs [physics.acc-ph]. Université Paris-Saclay, 2017. Français. ⟨NNT : 2017SACLS468⟩. ⟨tel-01739769⟩

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