Berlin 2018 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 53: Liquid and Amorphous Metals
MM 53.2: Talk
Thursday, March 15, 2018, 10:30–10:45, TC 010
Ni-Ti nanoglasses: amorphous structure, and magnetic properties — •Mohammed Reda Chellali1, Sree Harsha Nandam1, Suzhi Li1, Leonardo Velasco Estrada1, Robert Kruk1, and Horst Hahn1,2 — 1Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany — 2KIT-TUD Joint Research Laboratory Nanomaterials, Institute of Materials Science, Technische Universität Darmstadt (TUD), Jovanka-Bontschits-Str. 2, D-64287 Darmstadt, Germany
The so-called nanoglasses display very spectacular properties, such as highly catalytic activity, mechanical performance, or magnetic characteristics, which differ significantly from any known amorphous mixtures. Here, Ni50Ti50 the nanometer-sized glassy particles are generated by means of inert-gas condensation (IGC). Elemental segregation of Ni and Ti is observed in consolidated nanoglasses. The structure of the nanostructured metallic glasses is found to consist of nanometer-sized amorphous regions which are connected by glass-glass interfaces. It is shown that Ni50Ti50 nanoglass is a ferromagnetic whereas the amorphous and crystalline samples with the same chemical composition (Ni50Ti50) are paramagnetic. The ferromagnetism is clarified by the existence of such regions of low atomic density.