Near-Surface Strain in Icosahedra of Binary Metallic Alloys: Segregational vs. Intrinsic Effects


Near-Surface Strain in Icosahedra of Binary Metallic Alloys: Segregational vs. Intrinsic Effects

Pohl, D.; Wiesenhütter, U.; Mohn, E.; Schultz, L.; Rellinghaus, B.

A systematic structural analysis of of FePt, CuAu and Au icosahedral nanoparticles is presented. The uncovered particles are prepared by inert gas condensation and thermally equilibrated through in-flight optical annealing. Aberration-corrected high resolution Transmission electron microscopy reveals that the crystal lattice is significantly expanded near the particle surface. These experimental findings are corroborated by molecular statics simulations which show that this near-surface strain originates from both intrinsic strain due to the icosahedral structure and a partial segregation of the larger of the two alloy constituents to the particle surface.

Keywords: FePt Nanoparticles HRTEM

Permalink: https://www.hzdr.de/publications/Publ-19452
Publ.-Id: 19452