Dresden 2006 – wissenschaftliches Programm

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MM: Metall- und Materialphysik

MM 40: Nanostructured Materials III

MM 40.2: Vortrag

Freitag, 31. März 2006, 11:15–11:30, IFW D

Aerosol synthesis of magnetic iron oxide nanoparticles — •Markus Ames, Andreas Tschöpe, and Rainer Birringer — Universität des Saarlandes, FR 7.3 Technische Physik, Postfach 151150, 66041 Saarbrücken

The metal-organic compound [Fe(O^tBu)₃]₂ is used as precursor in CVD processes to deposit thin films of iron oxide on a substrate. Depending on substrate temperature, three different modifications were observed: Haematite (α−Fe₂O₃), Maghemite (γ−Fe₂O₃) and Magnetite (Fe₃O₄). The purpose of the present study was to evaluate this particular precursor for aerosol synthesis of nanocrystalline iron oxide particles. The reaction temperature in a hot-wall reactor was varied between 300^∘C and 800^∘C. The produced materials were characterized by X-ray diffraction, magnetization measurements and transmission electron microscopy. At temperatures below 400^∘C the yield of material was too low to allow further examination. The X-ray diffraction analysis revealed that Haematite was not produced and only Maghemite or Magnetite was found at all temperatures. The latter phases could not be distinguished by XRD due to their similar diffraction patterns. From magnetization measurements a saturation magnetization between 40 and 50 emu/g was obtained.