Berlin 2015 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 28: Poster Session II

MM 28.19: Poster

Dienstag, 17. März 2015, 18:30–20:30, Poster E

In-situ and ex-situ HRTEM characterization of heated, supersaturated metal-carbide nanoparticles — •Michael Hering1,2, Darius Pohl1, Ludwig Schultz1, and Bernd Rellinghaus11IFW Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany — 2TU Dresden, IFWW, D-01062 Dresden, Germany

The segregation of carbon from supersaturated metal-carbon compounds is a highly important step in the production of many novel materials. It is, e. g., an essential process during the growth of carbon nanotubes or in the formation of high-anisotropy granular magnetic FePt-X films. A detailed knowledge of this segregation is thus mandatory. Inert gas condensation is utilized to fabricate Fe-C and Ni-C nanoparticles, and much effort is made to determine the key parameters to tune the size, morphology and structure of the particles in order to generate single-crystalline or well faceted polycrystalline carbide particles with high carbon content. The characterization of these particles is then performed in an aberration-corrected FEI Titan3 80-300 microscope. The poster presents in a first part the different types of Fe-C and Ni-C particles and correlates the observed structures to the applied process parameters. E.g., in case of Fe-C nanoparticles, the inert gas condensation process mostly results in the formation of particles with a distinct core-shell structure of an iron core surrounded by a carbide shell. The carbon segregation of these particles as induced by a thermal treatment is then presented in the second part. Therefore, a special TEM sample holder for in-situ heating experiments with silicon nitride window chips is used.

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