Berlin 2012 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 9: Poster I - Biomagnetism, FePt Nanoparticles, Magnetic Particles/Clusters, Magnetic Materials, Magnetic Semiconductors, Half-metals/Oxides, Multiferroics, Topological Insulators, Spin structures/Phase transitions, Electron theory/Computational micromagnetics, Magnetic coupling phenomena/Exchange bias, Spin-dependent transport, Spin injection/spin currents, Magnetization/Demagnetization dynamics, Magnetic measurement techniques

DF 9.43: Poster

Dienstag, 27. März 2012, 12:15–15:15, Poster A

Synthesis and characterisation of BaTiO₃ nanopowders and CoFe₂O₄/BaTiO₃ nanocomposites — •Yanling Gao, Morad Etier, and Doru C. Lupascu — Institute for Materials Science, University Duisburg-Essen, Universitätsstrasse 15, 45141 Essen, Germany

Multiferroic materials have drawn much attention, because they display the coexistence of ferroelectric and magnetic properties. In this study, we have succeeded in the synthesis and characterization of the BaTiO₃ nanocrystals by the low cost and straightforward auto-combustion process of amorphous organic precursor. In the following, CoFe₂O₄/BaTiO₃ nanocomposites with core/shell structures were also obtained by using this process. The particles are systematically characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric, differential thermal analyses (TGA/DTA), and infrared spectroscopy (IR). The XRD results confirm the presence of both the spinel and the perovskite phases. The SEM-EDX and the atomic force microscopy (AFM) micrographs of CoFe₂O₄/BaTiO₃ show two-phase composite nanostructures of a cobalt ferrite core coated with a BaTiO₃ shell. The weight fraction of CoFe₂O₄ and the size of nanocomposites are the keys to the dielectric and magnetic properties of CoFe₂O₄/BaTiO₃ nanocomposites.