Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 17: Poster Session

MM 17.48: Poster

Montag, 26. März 2012, 17:00–19:00, Poster B

nanoscale solid-solid dissolution of crystalline/amorphours nanoparticles by electron beam irradiation — •Tao Feng^1,2, Di Wang¹, Ralf Witte¹, Robort Kruk¹, Horst Hahn¹, and Herbert Gleiter¹ — ¹Karlsruhe Institute of Technology, Institute for Nanotechnology, Karlsruhe, Germany — ²Engineering Research Center for Nanophotonics & Advanced Inst6rument, Ministry of Education, Department of Physics, East China Normal University, Shanghai, China

The diffusion behavior between different chemical composition nanoparticles is very critical for understanding the performance stability and lifetime of nanoparticles. Here, we report a systematic study carried out “in-situ” in the transmission electron microscopy (TEM) on an electron-irradiation-induced transformation of crystalline Pd/amorphous Fe₂₅Sc₇₅ core/shell nanoparticles, which are prepared by co-evaporation Pd metal and Fe₄₅Sc₅₅ alloy in an inert gas condensation (IGC) system. Under the low electron beam irradiation (below 1×10⁶ electrons nm⁻²s⁻¹), the crystal lattice of Pd disappeared gradually, accompanying with the growth of Pd domain. High-sensitivity energy-dispersive X-ray (EDX) spectroscopy give the direct evidences of the atomic diffusion between Pd and Sc, which cause to form an new amorphous compound of PdFeSc in the core/shell nanoparticles. Such physical manipulations of nanoparticles can be exploited as a tool to access novel nanoglass.