Element-specific quantitative determination of the local atomic order in CoPt alloy nanoparticles: Experiment and theory - Archive ouverte HAL Access content directly
Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2013

Element-specific quantitative determination of the local atomic order in CoPt alloy nanoparticles: Experiment and theory

Aline Y. Ramos
L. Bardotti
O. Boisron

Abstract

An annealing-driven transition from a chemically disordered A1-like structure to a chemically ordered L10-like phase has been revealed for size-selected CoPt clusters with diameters from 2 to 4 nm, from experiment to theory confrontation. For chemically ordered particles, atypical lattice-parameter ratios c/a are inferred. This ratio is found to be remarkably different depending on the approach used (c/a>1 from x-ray absorption at the Co K edge and c/a≃0.94 from the Pt dominated x-ray diffraction). A first-principles theoretical study accurately explains this astonishing feature and provides a detailed understanding of the element-specific local relaxations, which are crucial in these nanoalloys.
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Dates and versions

hal-00838951 , version 1 (01-07-2013)

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Nils Blanc, L.E. Diaz-Sanchez, Aline Y. Ramos, Florent Tournus, Hélio Tolentino, et al.. Element-specific quantitative determination of the local atomic order in CoPt alloy nanoparticles: Experiment and theory. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2013, 87 (15), pp.155412. ⟨10.1103/PhysRevB.87.155412⟩. ⟨hal-00838951⟩
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