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Article Dans Une Revue Acta Crystallographica Section A : Foundations and Advances [2014-...] Année : 2022

In situ 3D observations of a core–shell volume transition in an Ni 3 Fe nanocrystal using Bragg coherent X-ray diffraction imaging

Résumé

Coherent X-ray Diffraction Imaging (CDI) [1] allows for the in situ 3D mapping of the structural changes during phase transitions and chemical reactions, with a fair spatial resolution of the order of magnitude of 10 nm [2]. Using this technique in multi-Bragg conditions (Bragg CDI on multiple reflections), it was possible to follow the structural evolution (change in morphology, variation of the displacement and strain fields) as a function of temperature in a 300 nm Ni3Fe nanocrystal. During this volume transition, which happens between 500°C and 600°C, a core-shell structure is progressively observed with two distinct lattice parameters (difference of 0.39%, corresponding to two different Ni:Fe ratios), leading to highly strained and coherent domains. A rounding of the particle is also observed, with a disappearing of the initial facets. Static molecular calculations (LAMMPS) of different systems, such as faceted and core-shell nanoparticles, complete this work and allow for the confirmation of a core-shell structure. This study shows the perfect ability of modern phase retrieval methods to reconstruct highly strained systems such as core-shell nanoparticles.
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Dates et versions

cea-04066341 , version 1 (28-08-2023)

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Citer

C. Chatelier, C. Atlan, M. Dupraz, Ni Li, E. Rabkin, et al.. In situ 3D observations of a core–shell volume transition in an Ni 3 Fe nanocrystal using Bragg coherent X-ray diffraction imaging. Acta Crystallographica Section A : Foundations and Advances [2014-..], 2022, 78 (a2), pp.e766-e766. ⟨10.1107/S2053273322090192⟩. ⟨cea-04066341⟩
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