title: Near-surface strain in icosahedra of binary metallic alloys: segregational versus intrinsic effects.
abstract: A systematic structural analysis 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 that 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.
authors.affiliation: Institute for Metallic Materials, Leibniz Institute for Solid State and Materials Research (IFW) Dresden , P.O. Box 270116, D-01171 Dresden, Germany.
authors.forename: Darius
authors.initials: D
authors.lastname: Pohl
authors.forename: Ulrich
authors.initials: U
authors.lastname: Wiesenhütter
authors.forename: Elias
authors.initials: E
authors.lastname: Mohn
authors.forename: Ludwig
authors.initials: L
authors.lastname: Schultz
authors.forename: Bernd
authors.initials: B
authors.lastname: Rellinghaus