Unveiling Core–Shell Structure Formation in a Ni 3 Fe Nanoparticle with In Situ Multi-Bragg Coherent Diffraction Imaging - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue (Article De Synthèse) ACS Nano Année : 2024

Unveiling Core–Shell Structure Formation in a Ni 3 Fe Nanoparticle with In Situ Multi-Bragg Coherent Diffraction Imaging

Résumé

Solid-state reactions play a key role in materials science. The evolution of the structure of a single 350 nm Ni3Fe nanoparticle, i.e., its morphology (facets) as well as its deformation field, has been followed by applying multireflection Bragg coherent diffraction imaging. Through this approach, we unveiled a demixing process that occurs at high temperatures (600 °C) under an Ar atmosphere. This process leads to the gradual emergence of a highly strained core–shell structure, distinguished by two distinct lattice parameters with a difference of 0.4%. Concurrently, this transformation causes the facets to vanish, ultimately yielding a rounded core–shell nanoparticle. This final structure comprises a Ni3Fe core surrounded by a 40 nm Ni-rich outer shell due to preferential iron oxidation. Providing in situ 3D imaging of the lattice parameters at the nanometer scale while varying the temperature, this study─with the support of atomistic simulations─not only showcases the power of in situ multireflection BCDI but also provides valuable insights into the mechanisms at work during a solid-state reaction characterized by a core–shell transition.
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Dates et versions

hal-04580093 , version 1 (19-05-2024)

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Corentin Chatelier, Clément Atlan, Maxime Dupraz, Steven Leake, Ni Li, et al.. Unveiling Core–Shell Structure Formation in a Ni 3 Fe Nanoparticle with In Situ Multi-Bragg Coherent Diffraction Imaging. ACS Nano, 2024, ⟨10.1021/acsnano.3c11534⟩. ⟨hal-04580093⟩
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