Effect of iron addition on the properties of ZnO obtained by precipitation
|Daniel Sibera 1, Urszula Narkiewicz 1, Izabela Kudelska 2, Witold Daniel Dobrowolski 2|
1. Szczecin University of Technology, Institute of Chemical and Environment Engineering, Szczecin 70-322, Poland
New ferromagnetic semi-conductors are interesting because of the expectations connected with their use in magnetoelectronic or spintronic devices. Potential candidates are semi-conductive oxides of metals doped with ions or oxides of transition metals, as for example zinc oxide doped with iron oxide. Such samples were prepared by wet chemical method - precipitation from nitrate solutions using ammonia. The obtained hydroxides were filtered, dried and calcined at 300 0C during 1 hour. A series of samples containing 5 to 95 wt.% of Fe2O3 was obtained. The prepared samples are ferromagnetic. The phase composition of the samples was determined using XRD. Depending on the chemical composition the phases of hexagonal ZnO, and/or romboedric Fe2O3 and/or cubic ZnFe2O4 were identified. The mean crystallite size of these phases, determined using Scherrer’s formula, varied from 8 to 30 nm. The real chemical composition of the samples determined using ICP AES method was close to the assumed one. The measurements of density and surface area showed a good quality of nanopowders. The morphology of the samples was investigated using scanning electron microscopy. Spherical or elongated nano-grains can be observed. The measurements of magnetization were also carried out.
Presentation: Poster at E-MRS Fall Meeting 2007, Symposium A, by Daniel Sibera
See On-line Journal of E-MRS Fall Meeting 2007
Submitted: 2007-05-07 10:57 Revised: 2009-06-07 00:44