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Generating Metallic Amorphous Core–Shell Nanoparticles by a Solid‐State Amorphization Process
Authors:Tao Feng  Di Wang  Chaomin Wang  Na Chen  Horst Hahn  Herbert Gleiter
Affiliation:1. Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing, China;2. Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany;3. Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany;4. School of Materials Science and Engineering Tsinghua University, Beijing, China
Abstract:Metallic crystalline/amorphous core–shell nanoparticles consisting of a crystalline Pd core (c‐Pd) surrounded by an amorphous Fe25Sc75 shell (a‐FeSc) are prepared by inert‐gas condensation. A phase transformation of the c‐Pd by a solid‐state diffusion process resulting in an amorphous core (a‐PdSc) surrounded by an amorphous FeSc shell is observed if the core–shell structure is irradiated at ambient temperature with 300 keV electrons. The amorphization process seems to involve the diffusion of irradiation‐induced defects and is presumably driven by the large negative heat of mixing of Pd and Sc, as well as by the excess enthalpy of the interfaces between the c‐Pd regions and the surrounding a‐FeSc. The structural transformation reported here opens a new way to producing metallic amorphous core–shell nanoparticles of different chemical compositions and probably novel properties.
Keywords:electron beam irradiation  interfaces  metallic amorphous core–  shell nanoparticles  solid‐state amorphization  transmission electron microscopy
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